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g = [
        (a for a in range(10)),

        ((b,b) for b in range(10)),

        (b for
            b in
            range(20)),

        ((x,y, z)
            for
                x
                in
                range(2)
                for y in
                    range(2)
                    for z in range(2)),

        ((x for x in range(y)) for y in range(2))
]