pair,contact1,contact2,flow1,flow2 4ery_D_,2,5,1,1 4ery_D_,4,9,1,1 4ery_D_,4,10,1,1 4ery_D_,6,9,1,1 4ery_D_,7,10,1,1 4ery_D_,12,13,1,1