context: It is probably not the case that Daniel dropped the milk. Chances are about even that Bernhard is gray. It is probable that Brian is a lion. It is probably not the case that if Daniel dropped the milk, and Brian is a lion, then John left the apple. There is almost no chance that if Brian is a lion, or Bernhard is gray, then Julius is a swan. It is highly unlikely that if Daniel dropped the milk, or Brian is a lion, then Mary went to the hallway.
hypothesis: It is probably the case that either Brian is a lion, or Julius is a swan.
valid_hypothesis: It is probably the case that either Brian is a lion, or Julius is a swan.
invalid_hypothesis: We doubt that either Brian is a lion, or Julius is a swan.
hypothesis_assertion: Either Brian is a lion, or Julius is a swan.