context: Chances are slight that Lily is a swan. There is a better than even chance that Bernhard is a frog. It is probably not the case that Brian is a frog. It is highly likely that if Bernhard is a frog, and Lily is a swan, then Greg is a lion. It is likely that if Lily is a swan, and Bernhard is a frog, then Sandra left the football. We doubt that if either Lily is a swan, or Brian is a frog, then Mary went to the kitchen.
hypothesis: It is probably not the case that brian is a frog, or Sandra left the football.
valid_hypothesis: It is probably not the case that brian is a frog, or Sandra left the football.
invalid_hypothesis: There is a very good chance that brian is a frog, or Sandra left the football.
hypothesis_assertion: Brian is a frog, or Sandra left the football.