# r[2 6 9
-1 -1 -1 0 0 0 0 0 0
-1  1  0 1 0 0 0 0 5
 1  4  0 0 1 0 0 0 45
 2  1  0 0 0 1 0 0 27
 3 -4  0 0 0 0 1 0 24
 0  0  1 0 0 0 0 1 4

