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