They harvest leaves as an indirect source of food (they grow a fungus on the leaves and eat the fungus).
(they; eat; the fungus) (they; grow; a fungus on the leaves) Context(they grow,List([51, 60))):(They; harvest; leaves; as an indirect source of food)
they grow,List([51, 60))
they they They
eat grow harvest
the fungus
a fungus on the leaves
leaves as an indirect source of food