context: It is certain that Sandra took the milk. There is a better than even chance that Julius is yellow. It is probable that Lily is green. We believe that if Sandra took the milk, or Lily is green, then Brian is a lion. Chances are slight that if Julius is yellow, and Sandra took the milk, then Mary left the apple. Chances are slight that if either Julius is yellow, or Lily is green, then Fred went to the garden.
hypothesis: Chances are about even that either Brian is a lion, or Lily is green.
valid_hypothesis: Chances are about even that either Brian is a lion, or Lily is green.
invalid_hypothesis: It is certain that either Brian is a lion, or Lily is green.
hypothesis_assertion: Either Brian is a lion, or Lily is green.