context: It is probably the case that Brian is a swan. It is likely that Fred is in the bedroom. We believe that Julius is a lion. It is almost certain that if either Brian is a swan, or Julius is a lion, then Greg is green. There is a better than even chance that if Fred is in the bedroom, or Julius is a lion, then Lily is yellow. Chances are about even that if Julius is a lion, or Brian is a swan, then Mary went to the bedroom.
hypothesis: It is certain that either Mary went to the bedroom, or Lily is yellow.
valid_hypothesis: Chances are about even that either Mary went to the bedroom, or Lily is yellow.
invalid_hypothesis: It is certain that either Mary went to the bedroom, or Lily is yellow.
hypothesis_assertion: Either Mary went to the bedroom, or Lily is yellow.