context: There is a better than even chance that Mary moved to the office. It is impossible that Julius is gray. It is probably not the case that Winona is a mouse. It is improbable that if Julius is gray, or Winona is a mouse, then Lily is a lion. It is unlikely that if Julius is gray, or Mary moved to the office, then John took the football. There is a very good chance that if Julius is gray, or Mary moved to the office, then Fred went to the hallway.
hypothesis: It is certain that either Julius is gray, or Fred went to the hallway.
valid_hypothesis: Chances are about even that either Julius is gray, or Fred went to the hallway.
invalid_hypothesis: It is certain that either Julius is gray, or Fred went to the hallway.
hypothesis_assertion: Either Julius is gray, or Fred went to the hallway.