pair,contact1,contact2,flow1,flow2 1pby_C_,1,4,1,1 1pby_C_,4,7,1,1 1pby_C_,8,10,1,1 1pby_C_,8,16,1,1 1pby_C_,12,42,1,1 1pby_C_,18,20,1,1 1pby_C_,18,21,1,1 1pby_C_,18,22,1,1 1pby_C_,18,25,1,1 1pby_C_,23,26,1,1 1pby_C_,29,32,1,1 1pby_C_,30,33,1,1 1pby_C_,33,37,1,1 1pby_C_,34,37,1,1 1pby_C_,34,38,1,1 1pby_C_,35,39,1,1 1pby_C_,35,60,1,1 1pby_C_,37,42,1,1 1pby_C_,38,41,1,1 1pby_C_,38,49,1,1 1pby_C_,39,49,1,1 1pby_C_,48,52,1,1 1pby_C_,48,53,1,1 1pby_C_,53,56,1,1 1pby_C_,55,58,1,1 1pby_C_,56,71,1,1 1pby_C_,57,60,1,1 1pby_C_,59,69,1,1 1pby_C_,62,65,1,1 1pby_C_,62,66,1,1 1pby_C_,66,69,1,1 1pby_C_,67,70,1,1 1pby_C_,72,74,1,1