sentences: if something frog a sunburn then that something is required for that see
docs: chameleon_tree_frog is tree_toad. short_footed_frog is tree_frog. hanging_lamp is lamp. seeing_blury_images is sign_need_glasses. glass_frog is amphibian. thatching is roofing. poison_dart_frog is frog. without_shade_there is risk_of_sunburn. poison_dart_frog is amphibian. bleating_tree_frog is amphibian.