pair,contact1,contact2,flow1,flow2 8c2s_s_,2,4,1,1 8c2s_s_,6,10,1,1 8c2s_s_,12,15,1,1 8c2s_s_,14,18,1,1 8c2s_s_,15,19,1,1 8c2s_s_,16,20,1,1 8c2s_s_,17,21,1,1 8c2s_s_,18,22,1,1 8c2s_s_,19,23,1,1 8c2s_s_,20,27,1,1 8c2s_s_,21,24,1,1 8c2s_s_,23,27,1,1