def METHOD_NAME():
    from discopy.quantum.zx import Z, X, Id, SWAP
    source = X(2, 1) >> Z(1, 2)
    target = Z(1, 2) @ Z(1, 2) >> Id(1) @ SWAP @ Id(1) >> X(2, 1) @ X(2, 1)
    return Equation(source, target)