pair,contact1,contact2,flow1,flow2 6xy4_B_,2,5,1,1 6xy4_B_,2,6,1,1 6xy4_B_,3,7,1,1 6xy4_B_,4,8,1,1 6xy4_B_,5,9,1,1 6xy4_B_,6,9,1,1 6xy4_B_,7,11,1,1 6xy4_B_,8,12,1,1 6xy4_B_,9,13,1,1 6xy4_B_,10,14,1,1 6xy4_B_,11,15,1,1 6xy4_B_,12,16,1,1 6xy4_B_,13,17,1,1 6xy4_B_,14,18,1,1 6xy4_B_,15,19,1,1 6xy4_B_,16,20,1,1 6xy4_B_,17,21,1,1 6xy4_B_,18,22,1,1 6xy4_B_,19,23,1,1 6xy4_B_,20,24,1,1