validate		depends		go
node	shape	node	shape	time
n1	s1	n11	s11
n1	s2	n11	s11
n2	s1	n11	s11
n2	s2	n11	s11
n3	s3
n4	s3
n5	s5	n7	s7
n6	s5
n7	s7	n9	s9
n8	s7
n9	s9	n3	s4
n10	s9
n11	s11
n12	s11