sentences: some food contains carbohydrates
docs: ribose is carbohydrate. deoxyribose is carbohydrate. carbohydrate is nutrient. cane_sugar is carbohydrate. sugars is carbohydrates. dehydrated_food is foodstuff. sugar is carbohydrate. cereal has lots_of_carbohydrates all_breads is source_of_complex_carbohydrates.