sentences: food is made of carbohydrates
docs: ribose is carbohydrate. deoxyribose is carbohydrate. carbohydrate is nutrient. sugars is carbohydrates. dehydrated_food is foodstuff. starch is carbohydrate. sugar is carbohydrate. cereal has lots_of_carbohydrates all_breads is source_of_complex_carbohydrates.