pair,contact1,contact2,flow1,flow2
2thf_A_,5,8,1,1
2thf_A_,5,9,1,1
2thf_A_,5,10,1,1
2thf_A_,5,15,1,1
2thf_A_,8,11,1,1
2thf_A_,8,13,1,1
2thf_A_,9,12,1,1