0 1 a a
0 1 b b
0 1 c c
0 1 d d
0 1 e e
0 1 f f
0 1 0 0
0 1 1 1
0 1 2 2
0 1 3 3
0 1 4 4
0 1 5 5
0 1 6 6
0 1 7 7
0 1 8 8
0 1 9 9
1