pair,contact1,contact2,flow1,flow2
4pp6_C_,1,5,1,1
4pp6_C_,2,6,1,1
4pp6_C_,3,7,1,1
4pp6_C_,4,8,1,1
4pp6_C_,5,8,1,1
4pp6_C_,5,9,1,1