test
node1
BFO:0000015
process
node2
GO:0008150
biological_process
node1->node2
node5
GO:0008152
metabolic process
node2->node5
node3
BFO:0000003
occurrent
node3->node1
node3->node3
node4
BFO:0000001
entity
node4->node3
node6
GO:1902421
hydrogen metabolic
process
node5->node6