What are the purposes of these functions?

I have a contract here and public functions. Just wanted to know what their purposes of these functions are:

1.setFree
2.setSwapBackSettings

//
//
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.7;

/**

 * SAFEMATH LIBRARY
   */
    library SafeMath {
   function tryAdd(uint256 a, uint256 b)
       internal
       pure
       returns (bool, uint256)
   {
       unchecked {
           uint256 c = a + b;
           if (c < a) return (false, 0);
           return (true, c);
       }
   }

   function trySub(uint256 a, uint256 b)
       internal
       pure
       returns (bool, uint256)
   {
       unchecked {
           if (b > a) return (false, 0);
           return (true, a - b);
       }
   }

   function tryMul(uint256 a, uint256 b)
       internal
       pure
       returns (bool, uint256)
   {
       unchecked {
           // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
           // benefit is lost if 'b' is also tested.
           // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
           if (a == 0) return (true, 0);
           uint256 c = a * b;
           if (c / a != b) return (false, 0);
           return (true, c);
       }
   }

   function tryDiv(uint256 a, uint256 b)
       internal
       pure
       returns (bool, uint256)
   {
       unchecked {
           if (b == 0) return (false, 0);
           return (true, a / b);
       }
   }

   function tryMod(uint256 a, uint256 b)
       internal
       pure
       returns (bool, uint256)
   {
       unchecked {
           if (b == 0) return (false, 0);
           return (true, a % b);
       }
   }

   function add(uint256 a, uint256 b) internal pure returns (uint256) {
       return a + b;
   }

   function sub(uint256 a, uint256 b) internal pure returns (uint256) {
       return a - b;
   }

   function mul(uint256 a, uint256 b) internal pure returns (uint256) {
       return a * b;
   }

   function div(uint256 a, uint256 b) internal pure returns (uint256) {
       return a / b;
   }

   function mod(uint256 a, uint256 b) internal pure returns (uint256) {
       return a % b;
   }

   function sub(
       uint256 a,
       uint256 b,
       string memory errorMessage
   ) internal pure returns (uint256) {
       unchecked {
           require(b <= a, errorMessage);
           return a - b;
       }
   }

   function div(
       uint256 a,
       uint256 b,
       string memory errorMessage
   ) internal pure returns (uint256) {
       unchecked {
           require(b > 0, errorMessage);
           return a / b;
       }
   }

   function mod(
       uint256 a,
       uint256 b,
       string memory errorMessage
   ) internal pure returns (uint256) {
       unchecked {
           require(b > 0, errorMessage);
           return a % b;
       }
   }
    }

interface IBEP20 {
    function totalSupply() external view returns (uint256);

    function decimals() external view returns (uint8);
    
    function symbol() external view returns (string memory);
    
    function name() external view returns (string memory);
    
    function getOwner() external view returns (address);
    
    function balanceOf(address account) external view returns (uint256);
    
    function transfer(address recipient, uint256 amount)
        external
        returns (bool);
    
    function allowance(address _owner, address spender)
        external
        view
        returns (uint256);
    
    function approve(address spender, uint256 amount) external returns (bool);
    
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);
    
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(
        address indexed owner,
        address indexed spender,
        uint256 value
    );

}

abstract contract Auth {
    address internal owner;
    mapping(address => bool) internal authorizations;

    constructor(address _owner) {
        owner = _owner;
        authorizations[_owner] = true;
    }
    
    /**
     * Function modifier to require caller to be contract owner
     */
    modifier onlyOwner() {
        require(isOwner(msg.sender), "!OWNER");
        _;
    }
    
    /**
     * Function modifier to require caller to be authorized
     */
    modifier authorized() {
        require(isAuthorized(msg.sender), "!AUTHORIZED");
        _;
    }
    
    /**
     * Authorize address. Owner only
     */
    function authorize(address adr) public onlyOwner {
        authorizations[adr] = true;
    }
    
    /**
     * Remove address' authorization. Owner only
     */
    function unauthorize(address adr) public onlyOwner {
        authorizations[adr] = false;
    }
    
    /**
     * Check if address is owner
     */
    function isOwner(address account) public view returns (bool) {
        return account == owner;
    }
    
    /**
     * Return address' authorization status
     */
    function isAuthorized(address adr) public view returns (bool) {
        return authorizations[adr];
    }
    
    /**
     * Transfer ownership to new address. Caller must be owner. Leaves old owner authorized
     */
    function transferOwnership(address payable adr) public onlyOwner {
        owner = adr;
        authorizations[adr] = true;
        emit OwnershipTransferred(adr);
    }
    
    event OwnershipTransferred(address owner);

}

interface IUniswapV2Factory {
    function createPair(address tokenA, address tokenB)
        external
        returns (address pair);
}

interface IUniswapV2Router {
    function factory() external pure returns (address);

    function WETH() external pure returns (address);
    
    function addLiquidity(
        address tokenA,
        address tokenB,
        uint256 amountADesired,
        uint256 amountBDesired,
        uint256 amountAMin,
        uint256 amountBMin,
        address to,
        uint256 deadline
    )
        external
        returns (
            uint256 amountA,
            uint256 amountB,
            uint256 liquidity
        );
    
    function addLiquidityETH(
        address token,
        uint256 amountTokenDesired,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    )
        external
        payable
        returns (
            uint256 amountToken,
            uint256 amountETH,
            uint256 liquidity
        );
    
    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external;
    
    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external payable;
    
    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external;

}

interface IDividendDistributor {
    function setDistributionCriteria(
        uint256 _minPeriod,
        uint256 _minDistribution
    ) external;

    function setShare(address shareholder, uint256 amount) external;
    
    function deposit() external payable;
    
    function process(uint256 gas) external;

}

contract DividendDistributor is IDividendDistributor {
    using SafeMath for uint256;

    address _token;
    
    struct Share {
        uint256 amount;
        uint256 totalExcluded; // excluded dividend
        uint256 totalRealised;
    }
    
    IBEP20 WMEMO = IBEP20(0xDDc0385169797937066bBd8EF409b5B3c0dFEB52); // WMEMO
    address WFTM = 0x21be370D5312f44cB42ce377BC9b8a0cEF1A4C83;
    IUniswapV2Router router;
    
    address[] shareholders;
    mapping(address => uint256) shareholderIndexes;
    mapping(address => uint256) shareholderClaims;
    
    mapping(address => Share) public shares;
    
    uint256 public totalShares;
    uint256 public totalDividends;
    uint256 public totalDistributed; // to be shown in UI
    uint256 public dividendsPerShare;
    uint256 public dividendsPerShareAccuracyFactor = 10**36;
    
    uint256 public minPeriod = 1 hours;
    uint256 public minDistribution = 10 * (10**18);
    
    uint256 currentIndex;
    
    bool initialized;
    modifier initialization() {
        require(!initialized);
        _;
        initialized = true;
    }
    
    modifier onlyToken() {
        require(msg.sender == _token);
        _;
    }
    
    constructor(address _router) {
        router = _router != address(0)
            ? IUniswapV2Router(_router)
            : IUniswapV2Router(0x16327E3FbDaCA3bcF7E38F5Af2599D2DDc33aE52); // Spirit Router
        _token = msg.sender;
    }
    
    function setDistributionCriteria(
        uint256 _minPeriod,
        uint256 _minDistribution
    ) external override onlyToken {
        minPeriod = _minPeriod;
        minDistribution = _minDistribution;
    }
    
    function setShare(address shareholder, uint256 amount)
        external
        override
        onlyToken
    {
        if (shares[shareholder].amount > 0) {
            distributeDividend(shareholder);
        }
    
        if (amount > 0 && shares[shareholder].amount == 0) {
            addShareholder(shareholder);
        } else if (amount == 0 && shares[shareholder].amount > 0) {
            removeShareholder(shareholder);
        }
    
        totalShares = totalShares.sub(shares[shareholder].amount).add(amount);
        shares[shareholder].amount = amount;
        shares[shareholder].totalExcluded = getCumulativeDividends(
            shares[shareholder].amount
        );
    }
    
    function deposit() external payable override onlyToken {
        uint256 balanceBefore = WMEMO.balanceOf(address(this));
    
        address[] memory path = new address[](2);
        path[0] = WFTM;
        path[1] = address(WMEMO);
    
        router.swapExactETHForTokensSupportingFeeOnTransferTokens{
            value: msg.value
        }(0, path, address(this), block.timestamp);
    
        uint256 amount = WMEMO.balanceOf(address(this)).sub(balanceBefore);
    
        totalDividends = totalDividends.add(amount);
        dividendsPerShare = dividendsPerShare.add(
            dividendsPerShareAccuracyFactor.mul(amount).div(totalShares)
        );
    }
    
    function process(uint256 gas) external override onlyToken {
        uint256 shareholderCount = shareholders.length;
    
        if (shareholderCount == 0) {
            return;
        }
    
        uint256 gasUsed = 0;
        uint256 gasLeft = gasleft();
    
        uint256 iterations = 0;
    
        while (gasUsed < gas && iterations < shareholderCount) {
            if (currentIndex >= shareholderCount) {
                currentIndex = 0;
            }
    
            if (shouldDistribute(shareholders[currentIndex])) {
                distributeDividend(shareholders[currentIndex]);
            }
    
            gasUsed = gasUsed.add(gasLeft.sub(gasleft()));
            gasLeft = gasleft();
            currentIndex++;
            iterations++;
        }
    }
    
    function shouldDistribute(address shareholder)
        internal
        view
        returns (bool)
    {
        return
            shareholderClaims[shareholder] + minPeriod < block.timestamp &&
            getUnpaidEarnings(shareholder) > minDistribution;
    }
    
    function distributeDividend(address shareholder) internal {
        if (shares[shareholder].amount == 0) {
            return;
        }
    
        uint256 amount = getUnpaidEarnings(shareholder);
        if (amount > 0) {
            totalDistributed = totalDistributed.add(amount);
            WMEMO.transfer(shareholder, amount);
            shareholderClaims[shareholder] = block.timestamp;
            shares[shareholder].totalRealised = shares[shareholder]
                .totalRealised
                .add(amount);
            shares[shareholder].totalExcluded = getCumulativeDividends(
                shares[shareholder].amount
            );
        }
    }
    
    function claimDividend() external {
        distributeDividend(msg.sender);
    }
    
    /*

returns the  unpaid earnings
*/
    function getUnpaidEarnings(address shareholder)
        public
        view
        returns (uint256)
    {
        if (shares[shareholder].amount == 0) {
            return 0;
        }

        uint256 shareholderTotalDividends = getCumulativeDividends(
            shares[shareholder].amount
        );
        uint256 shareholderTotalExcluded = shares[shareholder].totalExcluded;
    
        if (shareholderTotalDividends <= shareholderTotalExcluded) {
            return 0;
        }
    
        return shareholderTotalDividends.sub(shareholderTotalExcluded);
    }
    
    function getCumulativeDividends(uint256 share)
        internal
        view
        returns (uint256)
    {
        return
            share.mul(dividendsPerShare).div(dividendsPerShareAccuracyFactor);
    }
    
    function addShareholder(address shareholder) internal {
        shareholderIndexes[shareholder] = shareholders.length;
        shareholders.push(shareholder);
    }
    
    function removeShareholder(address shareholder) internal {
        shareholders[shareholderIndexes[shareholder]] = shareholders[
            shareholders.length - 1
        ];
        shareholderIndexes[
            shareholders[shareholders.length - 1]
        ] = shareholderIndexes[shareholder];
        shareholders.pop();
    }

}

contract FROGE is IBEP20, Auth {
    using SafeMath for uint256;

    uint256 public constant MASK = type(uint128).max;
    address WMEMO = 0xDDc0385169797937066bBd8EF409b5B3c0dFEB52; // WMEMO
    address public WFTM = 0x21be370D5312f44cB42ce377BC9b8a0cEF1A4C83;
    address DEAD = 0x000000000000000000000000000000000000dEaD;
    address ZERO = 0x0000000000000000000000000000000000000000;
    address DEAD_NON_CHECKSUM = 0x000000000000000000000000000000000000dEaD;
    
    string constant _name = "frogecoin";
    string constant _symbol = "FROGE";
    uint8 constant _decimals = 6;
    
    uint256 _totalSupply = 1_000_000_000_000 * (10**_decimals);
    uint256 public _maxTxAmount = _totalSupply.div(100); // 1%
    uint256 public _maxWallet = _totalSupply.div(40); // 2.5%
    
    mapping(address => uint256) _balances;
    mapping(address => mapping(address => uint256)) _allowances;
    
    mapping(address => bool) isFeeExempt;
    mapping(address => bool) isTxLimitExempt;
    mapping(address => bool) isDividendExempt;
    mapping(address => bool) public _isFree;
    
    uint256 liquidityFee = 600;
    uint256 buybackFee = 100;
    uint256 reflectionFee = 100;
    uint256 marketingFee = 0;
    uint256 totalFee = 800;
    uint256 feeDenominator = 10000;
    
    address public autoLiquidityReceiver =
        0x000000000000000000000000000000000000dEaD; // auto-liq address 
    address public marketingFeeReceiver =
        0x884FF2A87d0E4349445bC91dEF1ebdF2B6cbefd4; // marketing address
    
    uint256 targetLiquidity = 25;
    uint256 targetLiquidityDenominator = 100;
    
    IUniswapV2Router public router;
    address public pair;
    
    uint256 public launchedAt;
    uint256 public launchedAtTimestamp;
    
    uint256 buybackMultiplierNumerator = 200;
    uint256 buybackMultiplierDenominator = 100;
    uint256 buybackMultiplierTriggeredAt;
    uint256 buybackMultiplierLength = 30 minutes;
    
    bool public autoBuybackEnabled = false;
    mapping(address => bool) buyBacker;
    uint256 autoBuybackCap;
    uint256 autoBuybackAccumulator;
    uint256 autoBuybackAmount;
    uint256 autoBuybackBlockPeriod;
    uint256 autoBuybackBlockLast;
    
    DividendDistributor distributor;
    address public distributorAddress;
    
    uint256 distributorGas = 500000;
    
    bool public swapEnabled = true;
    uint256 public swapThreshold = _totalSupply / 1000; // 0.1%
    bool inSwap;
    modifier swapping() {
        inSwap = true;
        _;
        inSwap = false;
    }
    
    constructor() Auth(msg.sender) {
        address _router = 0x16327E3FbDaCA3bcF7E38F5Af2599D2DDc33aE52; // SpiritSwap Router
        router = IUniswapV2Router(_router);
        pair = IUniswapV2Factory(router.factory()).createPair(
            WFTM,
            address(this)
        );
        _allowances[address(this)][address(router)] = _totalSupply;
        WFTM = router.WETH();
        distributor = new DividendDistributor(_router);
        distributorAddress = address(distributor);
    
        isFeeExempt[msg.sender] = true;
        isTxLimitExempt[msg.sender] = true;
        isDividendExempt[pair] = true;
        isDividendExempt[address(this)] = true;
        isDividendExempt[DEAD] = true;
        buyBacker[msg.sender] = true;
    
        autoLiquidityReceiver = msg.sender;
    
        approve(_router, _totalSupply);
        approve(address(pair), _totalSupply);
        _balances[msg.sender] = _totalSupply;
        emit Transfer(address(0), msg.sender, _totalSupply);
    }
    
    receive() external payable {}
    
    function totalSupply() external view override returns (uint256) {
        return _totalSupply;
    }
    
    function decimals() external pure override returns (uint8) {
        return _decimals;
    }
    
    function symbol() external pure override returns (string memory) {
        return _symbol;
    }
    
    function name() external pure override returns (string memory) {
        return _name;
    }
    
    function getOwner() external view override returns (address) {
        return owner;
    }
    
    modifier onlyBuybacker() {
        require(buyBacker[msg.sender] == true, "");
        _;
    }
    
    function balanceOf(address account) public view override returns (uint256) {
        return _balances[account];
    }
    
    function allowance(address holder, address spender)
        external
        view
        override
        returns (uint256)
    {
        return _allowances[holder][spender];
    }
    
    function approve(address spender, uint256 amount)
        public
        override
        returns (bool)
    {
        _allowances[msg.sender][spender] = amount;
        emit Approval(msg.sender, spender, amount);
        return true;
    }
    
    function approveMax(address spender) external returns (bool) {
        return approve(spender, _totalSupply);
    }
    
    function transfer(address recipient, uint256 amount)
        external
        override
        returns (bool)
    {
        return _transferFrom(msg.sender, recipient, amount);
    }
    
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external override returns (bool) {
        if (_allowances[sender][msg.sender] != _totalSupply) {
            _allowances[sender][msg.sender] = _allowances[sender][msg.sender]
                .sub(amount, "Insufficient Allowance");
        }
    
        return _transferFrom(sender, recipient, amount);
    }
    
    function _transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) internal returns (bool) {
        if (inSwap) {
            return _basicTransfer(sender, recipient, amount);
        }
    
        // Max  tx check
        address routerAddress = 0x16327E3FbDaCA3bcF7E38F5Af2599D2DDc33aE52; // SpiritSwap Router
        // bool isBuy=sender== pair|| sender == routerAddress;
        bool isSell = recipient == pair || recipient == routerAddress;
    
        checkTxLimit(sender, amount);
    
        // Max wallet check excluding pair and router
        if (!isSell && !_isFree[recipient]) {
            require(
                (_balances[recipient] + amount) < _maxWallet,
                "Max wallet has been triggered"
            );
        }
    
        // No swapping on buy and tx
        if (isSell) {
            if (shouldSwapBack()) {
                swapBack();
            }
            if (shouldAutoBuyback()) {
                triggerAutoBuyback();
            }
        }
        //        if(!launched() && recipient == pair){ require(_balances[sender] > 0); launch(); }
    
        _balances[sender] = _balances[sender].sub(
            amount,
            "Insufficient Balance"
        );
    
        uint256 amountReceived = shouldTakeFee(sender)
            ? takeFee(sender, recipient, amount)
            : amount;
    
        _balances[recipient] = _balances[recipient].add(amountReceived);
    
        if (!isDividendExempt[sender]) {
            try distributor.setShare(sender, _balances[sender]) {} catch {}
        }
        if (!isDividendExempt[recipient]) {
            try
                distributor.setShare(recipient, _balances[recipient])
            {} catch {}
        }
    
        try distributor.process(distributorGas) {} catch {}
    
        emit Transfer(sender, recipient, amountReceived);
        return true;
    }
    
    function _basicTransfer(
        address sender,
        address recipient,
        uint256 amount
    ) internal returns (bool) {
        _balances[sender] = _balances[sender].sub(
            amount,
            "Insufficient Balance"
        );
        _balances[recipient] = _balances[recipient].add(amount);
        //        emit Transfer(sender, recipient, amount);
        return true;
    }
    
    function checkTxLimit(address sender, uint256 amount) internal view {
        require(
            amount <= _maxTxAmount || isTxLimitExempt[sender],
            "TX Limit Exceeded"
        );
    }
    
    function shouldTakeFee(address sender) internal view returns (bool) {
        return !isFeeExempt[sender];
    }
    
    function getTotalFee(bool selling) public view returns (uint256) {
        if (launchedAt + 1 >= block.number) {
            return totalFee;
        }
        if (selling) {
            return totalFee;
        }
        return totalFee;
    }
    
    function getMultipliedFee() public view returns (uint256) {
        /**
         * if (launchedAtTimestamp + 1 days > block.timestamp) {
            return totalFee.mul(18000).div(feeDenominator);
        } else if (buybackMultiplierTriggeredAt.add(buybackMultiplierLength) > block.timestamp) {
            uint256 remainingTime = buybackMultiplierTriggeredAt.add(buybackMultiplierLength).sub(block.timestamp);
            uint256 feeIncrease = totalFee.mul(buybackMultiplierNumerator).div(buybackMultiplierDenominator).sub(totalFee);
            return totalFee.add(feeIncrease.mul(remainingTime).div(buybackMultiplierLength));
        }
        */
        return totalFee;
    }
    
    function takeFee(
        address sender,
        address receiver,
        uint256 amount
    ) internal returns (uint256) {
        uint256 feeAmount = amount.mul(getTotalFee(receiver == pair)).div(
            feeDenominator
        );
    
        _balances[address(this)] = _balances[address(this)].add(feeAmount);
        emit Transfer(sender, address(this), feeAmount);
    
        return amount.sub(feeAmount);
    }
    
    function shouldSwapBack() internal view returns (bool) {
        return
            msg.sender != pair &&
            !inSwap &&
            swapEnabled &&
            _balances[address(this)] >= swapThreshold;
    }
    
    function swapBack() internal swapping {
        uint256 dynamicLiquidityFee = isOverLiquified(
            targetLiquidity,
            targetLiquidityDenominator
        )
            ? 0
            : liquidityFee;
        uint256 amountToLiquify = swapThreshold
            .mul(dynamicLiquidityFee)
            .div(totalFee)
            .div(2);
        uint256 amountToSwap = swapThreshold.sub(amountToLiquify);
    
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = WFTM;
        uint256 balanceBefore = address(this).balance;
    
        router.swapExactTokensForETHSupportingFeeOnTransferTokens(
            amountToSwap,
            0,
            path,
            address(this),
            block.timestamp
        );
    
        uint256 amountFTM = address(this).balance.sub(balanceBefore);
    
        uint256 totalFTMFee = totalFee.sub(dynamicLiquidityFee.div(2));
    
        uint256 amountFTMLiquidity = amountFTM
            .mul(dynamicLiquidityFee)
            .div(totalFTMFee)
            .div(2);
        uint256 amountFTMReflection = amountFTM.mul(reflectionFee).div(
            totalFTMFee
        );
        uint256 amountFTMMarketing = amountFTM.mul(marketingFee).div(
            totalFTMFee
        );
    
        try distributor.deposit{value: amountFTMReflection}() {} catch {}
        payable(marketingFeeReceiver).transfer(amountFTMMarketing);
    
        if (amountToLiquify > 0) {
            router.addLiquidityETH{value: amountFTMLiquidity}(
                address(this),
                amountToLiquify,
                0,
                0,
                autoLiquidityReceiver,
                block.timestamp
            );
            emit AutoLiquify(amountFTMLiquidity, amountToLiquify);
        }
    }
    
    function shouldAutoBuyback() internal view returns (bool) {
        return
            msg.sender != pair &&
            !inSwap &&
            autoBuybackEnabled &&
            autoBuybackBlockLast + autoBuybackBlockPeriod <= block.number && // After N blocks from last buyback
            address(this).balance >= autoBuybackAmount;
    }
    
    function clearBuybackMultiplier() external authorized {
        buybackMultiplierTriggeredAt = 0;
    }
    
    function triggerAutoBuyback() internal {
        buyTokens(autoBuybackAmount, DEAD);
        autoBuybackBlockLast = block.number;
        autoBuybackAccumulator = autoBuybackAccumulator.add(autoBuybackAmount);
        if (autoBuybackAccumulator > autoBuybackCap) {
            autoBuybackEnabled = false;
        }
    }
    
    function buyTokens(uint256 amount, address to) internal swapping {
        address[] memory path = new address[](2);
        path[0] = WFTM;
        path[1] = address(this);
    
        router.swapExactETHForTokensSupportingFeeOnTransferTokens{
            value: amount
        }(0, path, to, block.timestamp);
    }
    
    function Sweep() external onlyOwner {
        uint256 balance = address(this).balance;
        payable(msg.sender).transfer(balance);
    }
    
    function setAutoBuybackSettings(
        bool _enabled,
        uint256 _cap,
        uint256 _amount,
        uint256 _period
    ) external authorized {
        autoBuybackEnabled = _enabled;
        autoBuybackCap = _cap;
        autoBuybackAccumulator = 0;
        autoBuybackAmount = _amount;
        autoBuybackBlockPeriod = _period;
        autoBuybackBlockLast = block.number;
    }
    
    function setBuybackMultiplierSettings(
        uint256 numerator,
        uint256 denominator,
        uint256 length
    ) external authorized {
        require(numerator / denominator <= 2 && numerator > denominator);
        buybackMultiplierNumerator = numerator;
        buybackMultiplierDenominator = denominator;
        buybackMultiplierLength = length;
    }
    
    function launched() internal view returns (bool) {
        return launchedAt != 0;
    }
    
    function launch() public authorized {
        require(launchedAt == 0, "Already launched boi");
        launchedAt = block.number;
        launchedAtTimestamp = block.timestamp;
    }
    
    function setMaxWallet(uint256 amount) external authorized {
        require(amount >= _totalSupply / 1000);
        _maxWallet = amount;
    }
    
    function setTxLimit(uint256 amount) external authorized {
        require(amount >= _totalSupply / 1000);
        _maxTxAmount = amount;
    }
    
    function setIsDividendExempt(address holder, bool exempt)
        external
        authorized
    {
        require(holder != address(this) && holder != pair);
        isDividendExempt[holder] = exempt;
        if (exempt) {
            distributor.setShare(holder, 0);
        } else {
            distributor.setShare(holder, _balances[holder]);
        }
    }
    
    function setIsFeeExempt(address holder, bool exempt) external authorized {
        isFeeExempt[holder] = exempt;
    }
    
    function setIsTxLimitExempt(address holder, bool exempt)
        external
        authorized
    {
        isTxLimitExempt[holder] = exempt;
    }
    
    function setFree(address holder) public onlyOwner {
        _isFree[holder] = true;
    }
    
    function unSetFree(address holder) public onlyOwner {
        _isFree[holder] = false;
    }
    
    function checkFree(address holder) public view onlyOwner returns (bool) {
        return _isFree[holder];
    }
    
    function setFees(
        uint256 _liquidityFee,
        uint256 _buybackFee,
        uint256 _reflectionFee,
        uint256 _marketingFee,
        uint256 _feeDenominator
    ) external authorized {
        liquidityFee = _liquidityFee;
        buybackFee = _buybackFee;
        reflectionFee = _reflectionFee;
        marketingFee = _marketingFee;
        totalFee = _liquidityFee.add(_buybackFee).add(_reflectionFee).add(
            _marketingFee
        );
        feeDenominator = _feeDenominator;
        require(totalFee < feeDenominator / 4);
    }
    
    function setFeeReceivers(
        address _autoLiquidityReceiver,
        address _marketingFeeReceiver
    ) external authorized {
        autoLiquidityReceiver = _autoLiquidityReceiver;
        marketingFeeReceiver = _marketingFeeReceiver;
    }
    
    function setSwapBackSettings(bool _enabled, uint256 _amount)
        external
        authorized
    {
        swapEnabled = _enabled;
        swapThreshold = _amount;
    }
    
    function setTargetLiquidity(uint256 _target, uint256 _denominator)
        external
        authorized
    {
        targetLiquidity = _target;
        targetLiquidityDenominator = _denominator;
    }
    
    function setDistributionCriteria(
        uint256 _minPeriod,
        uint256 _minDistribution
    ) external authorized {
        distributor.setDistributionCriteria(_minPeriod, _minDistribution);
    }
    
    function setDistributorSettings(uint256 gas) external authorized {
        require(gas < 750000);
        distributorGas = gas;
    }
    
    function getCirculatingSupply() public view returns (uint256) {
        return _totalSupply.sub(balanceOf(DEAD)).sub(balanceOf(ZERO));
    }
    
    function getLiquidityBacking(uint256 accuracy)
        public
        view
        returns (uint256)
    {
        return accuracy.mul(balanceOf(pair).mul(2)).div(getCirculatingSupply());
    }
    
    function isOverLiquified(uint256 target, uint256 accuracy)
        public
        view
        returns (bool)
    {
        return getLiquidityBacking(accuracy) > target;
    }
    
    event AutoLiquify(uint256 amountFTM, uint256 amountBOG);
    event BuybackMultiplierActive(uint256 duration);

}```

Hey @cybermonk
_isFree is mapping and represents all the addresses excluded from maxWallet limit

setSwapBackSettings is needed to enable/disable internal swaps and set the swap threshold

so setswapbacksettings is used to activate the reflections txs?

yes, if it is disabled no internal swaps happen