context: Chances are about even that Greg is white. Chances are about even that Lily is a lion. Chances are slight that John went to the kitchen. Chances are about even that if Greg is white, and John went to the kitchen, then Brian is gray. Chances are about even that if either John went to the kitchen, or Lily is a lion, then Bill is in the kitchen. It is probably not the case that if either John went to the kitchen, or Lily is a lion, then Sandra left the football.
hypothesis: It is unlikely that bill is in the kitchen, and Lily is a lion.
valid_hypothesis: It is unlikely that bill is in the kitchen, and Lily is a lion.
invalid_hypothesis: There is a very good chance that bill is in the kitchen, and Lily is a lion.
hypothesis_assertion: Bill is in the kitchen, and Lily is a lion.