context: It is certain that Lily is a lion. It is highly unlikely that John went to the bedroom. There is a very good chance that Sandra left the football. It is almost certain that if Sandra left the football, or Lily is a lion, then Gertrude is a sheep. It is certain that if Sandra left the football, or Lily is a lion, then Jessica is a cat. It is likely that if Lily is a lion, and John went to the bedroom, then Greg is a swan.
hypothesis: There is almost no chance that greg is a swan, and Gertrude is a sheep.
valid_hypothesis: There is almost no chance that greg is a swan, and Gertrude is a sheep.
invalid_hypothesis: Chances are about even that greg is a swan, and Gertrude is a sheep.
hypothesis_assertion: Greg is a swan, and Gertrude is a sheep.