[ 1, 2 ], [ 2, 3 ], [ 3, 4 ], [ 4, 5 ], [ 5, 1 ], [ 5, 7 ], [ 6, 5 ], [ 7, 6 ]
[ 2, 3, 4, 5, 1 ] [ 3, 4, 5, 1, 2 ] [ 4, 5, 1, 2, 3 ] [ 5, 1, 2, 3, 4 ] [ 1, 2, 3, 4, 5 ] [ 7, 6, 5 ] [ 5, 7, 6 ] [ 6, 5, 7 ]
(1 1 1 1 0 0 0) (0 1 1 1 1 0 1) (1 0 1 1 1 0 1) (1 1 0 1 1 0 1) (1 1 1 0 1 0 1) (1 1 1 0 1 1 0) (0 0 0 0 0 1 1)
None