context: It is highly likely that Julius is a rhino. Chances are slight that Fred went to the garden. It is highly unlikely that Lily is a lion.
hypothesis: It is impossible that fred went to the garden, and Lily is a lion.
valid_hypothesis: It is impossible that fred went to the garden, and Lily is a lion.
invalid_hypothesis: There is a better than even chance that fred went to the garden, and Lily is a lion.
hypothesis_assertion: Fred went to the garden, and Lily is a lion.