context: Two girls playing catch on a lawn
hypothesis: It is highly unlikely that sisters are tossing a frisbee back and forth in the park.
valid_hypothesis: It is highly unlikely that sisters are tossing a frisbee back and forth in the park.
invalid_hypothesis: Chances are about even that sisters are tossing a frisbee back and forth in the park.
hypothesis_assertion: Sisters are tossing a frisbee back and forth in the park.