In the sentence The owl has caught a mouse , the elements the owl, has caught, a mouse are each constituents in a way that owl has, caught a are not.
(The owl; has caught; a mouse) (the elements the owl, has caught, a mouse; are not; ) Context(the elements the owl , has caught , a mouse are not,List([45, 148))):(owl; has; )
the elements the owl , has caught , a mouse are not,List([45, 148))
The owl the elements the owl, has caught, a mouse owl
has caught are not has
a mouse