(
((2))
((6))

(1 1 3 1 1)
(1 1 5 1 1)

((1) (2 3 4))
((1) 4)

(9)
((8 7 6))

((4 4) 4 4)
((4 4) 4 4 4)

(7 7 7 7)
(7 7 7)

()
(3)

((()))
(())

(1 (2 (3 (4 (5 6 7)))) 8 9)
(1 (2 (3 (4 (5 6 0)))) 8 9)

)