dd n0 $0 1.00 +$1 1.00 <= 0.00 n1 −$0 1.00 +$1 1.00 <= 0.00 n0->n1 0 n2 −$0 1.00 +$1 1.00 <= 0.00 n0->n2 1 n3 $0 0.00 +$1 1.00 + 0.00 n1->n3 0 n4 $0 1.00 +$1 0.00 + 0.00 n1->n4 1 n5 −$0 1.00 +$1 0.00 + 0.00 n2->n5 0 n6 $0 0.00 −$1 1.00 + 0.00 n2->n6 1