a paper bag is ripped into pieces
shredded_paper is group_of_things. mailbag is bag. burn_bag is bag. plastic_bag is bag. paper_grocery_bag is not paper_sack. paper_grocery_bag is paper_sack. envelope is bag. paper_grocery_bag is grocery_bag. group_of_shreds_of_paper is shredded_paper. trash_bag is plastic_bag.