context: It is certain that Lily is yellow. There is almost no chance that Julius is green. It is probable that Bernhard is a swan. It is improbable that if Bernhard is a swan, and Lily is yellow, then Brian is a frog. There is a better than even chance that if Julius is green, or Bernhard is a swan, then Greg is a lion. It is certain that if either Bernhard is a swan, or Julius is green, then Sandra took the football.
hypothesis: It is almost certain that either Greg is a lion, or Brian is a frog.
valid_hypothesis: Chances are about even that either Greg is a lion, or Brian is a frog.
invalid_hypothesis: It is almost certain that either Greg is a lion, or Brian is a frog.
hypothesis_assertion: Either Greg is a lion, or Brian is a frog.