context: Chances are about even that Greg is a rhino. It is probably the case that Yann is tired. We doubt that Sandra got the football.
hypothesis: There is almost no chance that either Yann is tired, or Sandra got the football.
valid_hypothesis: There is a better than even chance that either Yann is tired, or Sandra got the football.
invalid_hypothesis: There is almost no chance that either Yann is tired, or Sandra got the football.
hypothesis_assertion: Either Yann is tired, or Sandra got the football.