context: Three children play with a giant sphere on a playground while an adult sits on a bench reading the newspaper.
hypothesis: It is impossible that a group of children are playing while their teacher watches them.
valid_hypothesis: It is impossible that a group of children are playing while their teacher watches them.
invalid_hypothesis: It is probable that a group of children are playing while their teacher watches them.
hypothesis_assertion: A group of children are playing while their teacher watches them.