context: A toddler is intrigued by a toy lego set in a bookstore.
hypothesis: It is certain that a boy is choosing a birthday gift for himself at the store.
valid_hypothesis: There is almost no chance that a boy is choosing a birthday gift for himself at the store.
invalid_hypothesis: It is certain that a boy is choosing a birthday gift for himself at the store.
hypothesis_assertion: A boy is choosing a birthday gift for himself at the store.