{
    (_0)(_1)(_add)
        /(dequeLength)
            (isEmpty)(lPopped)(lItem)(rPopped)(rItem)
                /
                    /
                        /[dequeLength][lPopped]
                    /
                        [_1]
                    [_add]
                /
                    [_0]
                [isEmpty]
        [YC]
|
    dequeLLength
}

{
    (_0)(_1)(_add)
        /(dequeLength)
            (isEmpty)(lPopped)(lItem)(rPopped)(rItem)
                /
                    /
                        /[dequeLength][rPopped]
                    /
                        [_1]
                    [_add]
                /
                    [_0]
                [isEmpty]
        [YC]
|
    dequeRLength
}