{
    /(dequeLPush)
        (deque)(item)
            /(isEmpty)(lPopped)(lItem)(rPopped)(rItem)
                /
                    (g) /[rItem]/</[item]/[rPopped][dequeLPush]>/[item]/[deque]/[0] [g]
                /
                    /[item][dequeSingle]
                [isEmpty]
            [deque]
    [YC]
|
    dequeLPush
}

{
    /(dequeRPush)
        (deque)(item)
            /(isEmpty)(lPopped)(lItem)(rPopped)(rItem)
                /
                    (g) /[item]/[deque]/[lItem]/</[item]/[lPopped][dequeRPush]>/[0] [g]
                /
                    /[item][dequeSingle]
                [isEmpty]
            [deque]
    [YC]
|
    dequeRPush
}