paper is inexpensive in free
sheet_of_paper is free_sheet. paper_currency is free_sheet. plastic_and_cardboard is both_inexpensive_materials. group_of_paper_currency is group_of_free_sheets. paper is not one_of_things. group_of_paper_currency is not group_of_free_sheets. paper_currency is not free_sheet. paper is one_of_things. waste_paper is not paper. sheet_of_paper is not free_sheet.