context: Chances are slight that Lily is a rhino. It is probable that Bernhard is a swan. It is probably the case that John dropped the milk.
hypothesis: Chances are about even that lily is a rhino, and John dropped the milk.
valid_hypothesis: It is highly unlikely that lily is a rhino, and John dropped the milk.
invalid_hypothesis: Chances are about even that lily is a rhino, and John dropped the milk.
hypothesis_assertion: Lily is a rhino, and John dropped the milk.