context: A gray rally car is being driven by two adult males while a large white container is tied down on top of the roof.
hypothesis: It is certain that the men hope the container won't fly off the roof.
valid_hypothesis: It is certain that the men hope the container won't fly off the roof.
invalid_hypothesis: It is impossible that the men hope the container won't fly off the roof.
hypothesis_assertion: The men hope the container won't fly off the roof.