Objects follow natural trajectories: they collide and reflect, they bounce and slide and grind to halt.
(they; reflect; ) (they; bounce; ) Context(they bounce,List([63, 74))):(Objects; follow; natural trajectories) Context(they bounce,List([63, 74))):(they; collide; ) (they; slide; )
they bounce,List([63, 74)) they bounce,List([63, 74))
they they Objects they they
reflect bounce follow collide slide
natural trajectories