context: There is a very good chance that Brian is a lion. It is impossible that Greg is a frog. It is highly unlikely that Gertrude is a wolf. It is highly likely that if Brian is a lion, and Greg is a frog, then Bernhard is white. It is highly likely that if Greg is a frog, or Brian is a lion, then John went to the garden. It is probable that if Greg is a frog, or Brian is a lion, then Mary moved to the office.
hypothesis: It is impossible that either Greg is a frog, or Bernhard is white.
valid_hypothesis: It is impossible that either Greg is a frog, or Bernhard is white.
invalid_hypothesis: We believe that either Greg is a frog, or Bernhard is white.
hypothesis_assertion: Either Greg is a frog, or Bernhard is white.