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    function findPositionInArrayForLoop(uint _item, uint[] memory _array) pure internal returns (uint i) { // requirements should come before.
        uint[] memory tmpArray = _array;
        uint arrayLength = tmpArray.length;

        for (i = 0; i < arrayLength;) {
            if (tmpArray[i] != _item) {
                unchecked {
                    i++;
                }