pair,contact1,contact2,flow1,flow2
4pps_C_,2,6,1,1
4pps_C_,3,7,1,1
4pps_C_,4,8,1,1
4pps_C_,5,9,1,1
4pps_C_,6,10,1,1
4pps_C_,8,11,1,1