context: It is certain that Winona is a cat. It is impossible that Greg is a lion. Chances are about even that Mary went to the office. It is unlikely that if Winona is a cat, or Mary went to the office, then Gertrude is a wolf. It is likely that if Winona is a cat, or Mary went to the office, then Julius is gray. We doubt that if Mary went to the office, and Greg is a lion, then Brian is green.
hypothesis: Chances are slight that either Greg is a lion, or Julius is gray.
valid_hypothesis: It is probable that either Greg is a lion, or Julius is gray.
invalid_hypothesis: Chances are slight that either Greg is a lion, or Julius is gray.
hypothesis_assertion: Either Greg is a lion, or Julius is gray.