Trees, for example, sustain squirrels who then help to distribute the seeds that reproduce the trees.
(the seeds; reproduce; the trees) (squirrels; help; to distribute the seeds; T:then) Context(squirrels help,List([28, 51))):(squirrels; help to distribute; the seeds that reproduce the trees)
squirrels help,List([28, 51))
the seeds squirrels squirrels
reproduce help help to distribute
the trees
to distribute the seeds T:then
the seeds that reproduce the trees