context: It is probably not the case that Sandra took the milk. It is almost certain that Lily is gray. It is probable that Greg is a swan. It is likely that if Sandra took the milk, or Lily is gray, then Mary went to the office. It is unlikely that if Lily is gray, or Sandra took the milk, then Julius is a frog. There is a very good chance that if Sandra took the milk, or Greg is a swan, then Brian is a rhino.
hypothesis: It is likely that brian is a rhino, or Sandra took the milk.
valid_hypothesis: It is likely that brian is a rhino, or Sandra took the milk.
invalid_hypothesis: There is almost no chance that brian is a rhino, or Sandra took the milk.
hypothesis_assertion: Brian is a rhino, or Sandra took the milk.