test
node1
BFO:0000001
entity
node2
BFO:0000003
occurrent
node1->node2
node2->node2
node3
BFO:0000015
process
node2->node3
node4
GO:0008150
biological_process
node3->node4
node5
GO:0051179
localization
node4->node5
node8
GO:0051234
establishment of
localization
node5->node8
node6
GO:0006810
transport
node7
GO:0015669
gas transport
node6->node7
node9
GO:0015671
oxygen transport
node7->node9
node8->node6