context: Chances are about even that Bernhard is a swan. It is unlikely that John dropped the apple. We doubt that Lily is a lion. It is almost certain that if either Bernhard is a swan, or John dropped the apple, then Julius is a rhino. It is improbable that if Bernhard is a swan, and Lily is a lion, then Greg is a frog. It is certain that if Bernhard is a swan, and Lily is a lion, then Bill went to the office.
hypothesis: It is probably the case that lily is a lion, and Julius is a rhino.
valid_hypothesis: Chances are slight that lily is a lion, and Julius is a rhino.
invalid_hypothesis: It is probably the case that lily is a lion, and Julius is a rhino.
hypothesis_assertion: Lily is a lion, and Julius is a rhino.