sentences: the big particle is a whole of the one paper
docs: dust_particle is solid_object. solid_sodium_chloride_particle is particle. large_molecule is molecule. weakly_interacting_massive_particle is dark_matter. matter_particle is particle. dust_particle is solid_object_particle. page is sheet_of_paper. solid_object_particle is particle. elementary_particle is particle. paper_page is almost_always.