pair,contact1,contact2,flow1,flow2
1hit_A_,4,7,1,1
1hit_A_,4,8,1,1
1hit_A_,5,9,1,1
1hit_A_,11,12,1,1
1hit_A_,12,15,1,1
1hit_A_,15,18,1,1
1hit_A_,16,19,1,1
1hit_A_,17,20,1,1