By the end of the experiment, people were using the same amount of force to lift boxes of both sizes.
(people; were using; the same amount of force; to lift boxes of both sizes; T:By the end of the experiment) Context(people were using,List([30, 47))):(people; were using the same amount of force to lift; boxes of both sizes)
people were using,List([30, 47))
people people
were using were using the same amount of force to lift
the same amount of force to lift boxes of both sizes T:By the end of the experiment
boxes of both sizes