context: It is unlikely that John dropped the apple. It is probably not the case that Greg is a frog. It is unlikely that Bernhard is gray. Chances are slight that if John dropped the apple, or Greg is a frog, then Brian is a lion. It is improbable that if John dropped the apple, and Greg is a frog, then Julius is a swan. We doubt that if Bernhard is gray, or Greg is a frog, then Mary went to the office.
hypothesis: It is highly unlikely that brian is a lion, or Julius is a swan.
valid_hypothesis: It is highly unlikely that brian is a lion, or Julius is a swan.
invalid_hypothesis: There is a very good chance that brian is a lion, or Julius is a swan.
hypothesis_assertion: Brian is a lion, or Julius is a swan.