test
node1
BFO:0000020
specifically
dependent continuant
node1->node1
node2
PATO:0000001
quality
node1->node2
node3
BFO:0000019
quality
node1->node3
node4
PATO:0001241
physical object
quality
node2->node4
node3->node3
node3->node4
node5
BFO:0000002
continuant
node5->node1
node5->node5
node6
BFO:0000001
entity
node6->node5