pair,contact1,contact2,flow1,flow2
2a3i_B_,2,3,1,1
2a3i_B_,3,7,1,1
2a3i_B_,4,8,1,1
2a3i_B_,5,9,1,1
2a3i_B_,6,10,1,1
2a3i_B_,7,11,1,1
2a3i_B_,8,11,1,1