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The following is an example contract:


// contracts/Box.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;

contract Box {
    uint256 private value;

    // Emitted when the stored value changes
    event ValueChanged(uint256 newValue);

    // Stores a new value in the contract
    function store(uint256 newValue) public {
        value = newValue;
        emit ValueChanged(newValue);

    // Reads the last stored value
    function retrieve() public view returns (uint256) {
        return value;

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A post was split to a new topic: We were unable to retrieve a valid Contract ABI for this contract