These are the force pairs: The earth pulls on the book with gravity, and the book pulls on the earth with gravity.
(the book; pulls; on the earth) (The earth; pulls; on the book with gravity) Context(The earth pulls,List([27, 42))):(These; are; the force pairs)
The earth pulls,List([27, 42))
the book The earth These
pulls pulls are
on the earth
on the book with gravity
the force pairs