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