context: We believe that Julius is a lion. It is probable that Lily is a frog. There is little chance that Brian is a rhino.
hypothesis: It is highly unlikely that brian is a rhino, and Lily is a frog.
valid_hypothesis: It is highly unlikely that brian is a rhino, and Lily is a frog.
invalid_hypothesis: There is a better than even chance that brian is a rhino, and Lily is a frog.
hypothesis_assertion: Brian is a rhino, and Lily is a frog.