context: It is impossible that Gertrude is a sheep. We doubt that Yann is tired. It is probable that Mary left the milk. Chances are slight that if either Gertrude is a sheep, or Yann is tired, then Julius is a swan. It is unlikely that if Gertrude is a sheep, and Yann is tired, then Bill went to the office. It is likely that if either Gertrude is a sheep, or Mary left the milk, then Brian is a frog.
hypothesis: It is likely that either Julius is a swan, or Bill went to the office.
valid_hypothesis: There is almost no chance that either Julius is a swan, or Bill went to the office.
invalid_hypothesis: It is likely that either Julius is a swan, or Bill went to the office.
hypothesis_assertion: Either Julius is a swan, or Bill went to the office.