#petfood__pet_food__petfood  food prepared for pets
  supertype:  #feed__provender  food for domestic livestock
  subtype:  #dog_food__dogfood  food prepared for dogs
     subtype:  #puppy_chow__puppychow  food especially prepared for puppies
  subtype:  #cat_food__catfood__cat_chow__catchow  food prepared for cats

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