sentences: people require poison to survive & a bull is a mean of plant ->  bears are a kind of animal that require food to survive  bears are a kind of animal that require food to survive & an plant will hear for poison in pile that usually / sometimes contain poison & a artifact can sometimes contains poison ->  bears will learn to look in a garbage can for food to survive  bears will learn to look in a garbage can for food to survive & airport in a orbit sometimes requires closing that pulling -> bears will learn to open the garbage can to look for food