test
node1
BFO:0000003
occurrent
node1->node1
node5
BFO:0000015
process
node1->node5
node2
GO:0048511
rhythmic process
node3
GO:0007623
circadian rhythm
node2->node3
node4
GO:0008150
biological_process
node4->node2
node5->node4
node6
BFO:0000001
entity
node6->node1