pair,contact1,contact2,flow1,flow2
6twn_C_,2,6,1,1
6twn_C_,3,7,1,1
6twn_C_,4,8,1,1
6twn_C_,5,9,1,1
6twn_C_,6,10,1,1
6twn_C_,7,11,1,1
6twn_C_,8,12,1,1
6twn_C_,9,13,1,1
6twn_C_,10,14,1,1
6twn_C_,11,15,1,1
6twn_C_,12,15,1,1
6twn_C_,12,16,1,1