(_ 6 6)
(4 3 _ 7)
(6 3 3 _)
(6 _ 4)
(_ 1 6 8 5)
(13 _ 2 10)
(3 2 _ 8)
(8 7 4 _)
(12 6 _)
(5 _ 6 12)
(2 _ 3)
(4 5 10 _)

(4 4 _ 4)