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linear linears line art minimalism minimal simple lines basic basics book books open pages page read reads reading readings hardcover hardcovers paper papers notes note text graduation graduate headwear hat hats outerwear clothing clothings mortarboard mortar cap caps chemical chemicals chemistry equipment equipments fluid fluids liquid glass glasses lab labs laboratory object objects research researching scientific solution solutions test tests exam tubes transparent translucent glassware glasswares sports sport game games ball balls rugby rugbies american football atomic structure atom molecule