test
node1
GO:0008152
metabolic process
node2
GO:0044237
cellular metabolic
process
node1->node2
node3
GO:0006790
sulfur compound
metabolic process
node2->node3
node5
GO:0019418
sulfide oxidation
node3->node5
node4
BFO:0000003
occurrent
node4->node4
node8
BFO:0000015
process
node4->node8
node6
GO:0009987
cellular process
node6->node2
node7
GO:0008150
biological_process
node7->node1
node7->node6
node8->node7
node9
BFO:0000001
entity
node9->node4