context: A graying man with glasses is standing in back of a barber's chair in a seemingly empty barber shop.
hypothesis: Chances are slight that a barber is waiting for customers in his shop.
valid_hypothesis: There is a better than even chance that a barber is waiting for customers in his shop.
invalid_hypothesis: Chances are slight that a barber is waiting for customers in his shop.
hypothesis_assertion: A barber is waiting for customers in his shop.