Some objects are so small that scientists must use powerful microscopes to see them.
(Some objects; are; so small that scientists must use powerful microscopes to see them) (scientists; must use; powerful microscopes; to see them) Context(scientists must use,List([31, 50))):(scientists; must use powerful microscopes to see; them)
scientists must use,List([31, 50))
Some objects scientists scientists
are must use must use powerful microscopes to see
so small that scientists must use powerful microscopes to see them
powerful microscopes to see them
them