context: Chances are about even that Julius is white. It is certain that Brian is a lion. It is highly likely that John left the football. We believe that if either Julius is white, or Brian is a lion, then Lily is a frog. Chances are about even that if Brian is a lion, and Julius is white, then Greg is yellow. It is unlikely that if Julius is white, or Brian is a lion, then Mary got the milk.
hypothesis: It is impossible that either Greg is yellow, or Lily is a frog.
valid_hypothesis: There is a better than even chance that either Greg is yellow, or Lily is a frog.
invalid_hypothesis: It is impossible that either Greg is yellow, or Lily is a frog.
hypothesis_assertion: Either Greg is yellow, or Lily is a frog.