,A1,A2,B1,B2,C1,C2
A1,0,4,5,1,0,0
A2,0,2,7,1,0,0
B1,0,0,3,6,0,1
B2,0,1,5,4,0,0
C1,0,0,0,3,4,3
C2,0,0,0,0,6,4