context: It is unlikely that Julius is a swan. It is certain that John went to the bedroom. It is almost certain that Daniel took the apple. It is highly unlikely that if either Julius is a swan, or Daniel took the apple, then Bernhard is a lion. We doubt that if John went to the bedroom, and Julius is a swan, then Greg is white. There is a better than even chance that if Julius is a swan, and Daniel took the apple, then Gertrude is a mouse.
hypothesis: It is probably the case that greg is white, or Bernhard is a lion.
valid_hypothesis: Chances are slight that greg is white, or Bernhard is a lion.
invalid_hypothesis: It is probably the case that greg is white, or Bernhard is a lion.
hypothesis_assertion: Greg is white, or Bernhard is a lion.