context: Two young men climb a tree overlooking a rural setting, with one of them out far on a limb and clutching a white helmet.
hypothesis: Chances are about even that two brothers are climbing a tree to get down their Frisbee.
valid_hypothesis: It is impossible that two brothers are climbing a tree to get down their Frisbee.
invalid_hypothesis: Chances are about even that two brothers are climbing a tree to get down their Frisbee.
hypothesis_assertion: Two brothers are climbing a tree to get down their Frisbee.