Example from Mehta and Patel 1983, table 1
 (P=0.0393)
5 7
1 2 2 1 1 0 1
2 0 0 2 3 0 0
0 1 1 1 2 7 3
1 1 2 0 0 0 1
0 1 1 1 1 0 0