test
node1
BFO:0000001
entity
node2
BFO:0000002
continuant
node1->node2
node2->node2
node9
BFO:0000004
independent
continuant
node2->node9
node3
PO:0025025
root system
node4
PO:0009005
root
node3->node4
node8
PO:0025476
tuberous root tuber
node4->node8
node5
PO:0009008
plant organ
node6
PO:0025004
plant axis
node5->node6
node6->node4
node7
PO:0025522
tuber
node6->node7
node7->node8
node9->node9
node12
BFO:0000040
material entity
node9->node12
node10
PO:0009011
plant structure
node11
PO:0025496
multi-tissue plant
structure
node10->node11
node15
PO:0025497
collective plant
structure
node10->node15
node11->node5
node13
PO:0025131
plant anatomical
entity
node12->node13
node13->node10
node14
PO:0025007
collective plant
organ structure
node14->node3
node15->node14