test
node1
GO:0008152
metabolic process
node2
GO:0044237
cellular metabolic
process
node1->node2
node3
GO:0046483
heterocycle metabolic
process
node2->node3
node4
GO:0009987
cellular process
node4->node2
node5
BFO:0000015
process
node6
GO:0008150
biological_process
node5->node6
node6->node1
node6->node4
node7
BFO:0000003
occurrent
node7->node5
node8
BFO:0000001
entity
node8->node7