pragma solidity ^0.5.2;

contract Store {
    event ItemSet(bytes32 key, bytes32 value);

    string public version;
    mapping (bytes32 => bytes32) public items;

    constructor(string memory _version) public {
        version = _version;
    }

    function setItem(bytes32 key, bytes32 value) external {
        items[key] = value;
        emit ItemSet(key, value);
    }
}