test
node1
GO:0008152
metabolic process
node2
GO:0071704
organic substance
metabolic process
node1->node2
node6
GO:0120246
acetylenic compound
metabolic process
node2->node6
node3
BFO:0000015
process
node4
GO:0008150
biological_process
node3->node4
node4->node1
node5
BFO:0000003
occurrent
node5->node3
node5->node5
node7
BFO:0000001
entity
node7->node5