a=0
 0 1 0
 1 0 1
 2 0 1
 3 0 1
 4 0 1
 5 0 1
 6 0 1
 7 0 1
a=1
 0 0 1
 1 1 0
 2 0 1
 3 0 1
 4 0 1
 5 0 1
 6 0 1
 7 0 1
a=2
 0 0 1
 1 0 1
 2 1 0
 3 0 1
 4 0 1
 5 0 1
 6 0 1
 7 0 1
a=3
 0 0 1
 1 0 1
 2 0 1
 3 1 0
 4 0 1
 5 0 1
 6 0 1
 7 0 1
a=4
 0 0 1
 1 0 1
 2 0 1
 3 0 1
 4 1 0
 5 0 1
 6 0 1
 7 0 1
a=5
 0 0 1
 1 0 1
 2 0 1
 3 0 1
 4 0 1
 5 1 0
 6 0 1
 7 0 1
a=6
 0 0 1
 1 0 1
 2 0 1
 3 0 1
 4 0 1
 5 0 1
 6 1 0
 7 0 1