context: It is impossible that Brian is white. It is improbable that John left the apple. There is almost no chance that Lily is a lion. Chances are slight that if either Lily is a lion, or John left the apple, then Greg is a lion. It is probably not the case that if either Brian is white, or John left the apple, then Mary dropped the apple. Chances are slight that if either Brian is white, or Lily is a lion, then Fred is in the bedroom.
hypothesis: Chances are slight that either Brian is white, or John left the apple.
valid_hypothesis: Chances are slight that either Brian is white, or John left the apple.
invalid_hypothesis: It is certain that either Brian is white, or John left the apple.
hypothesis_assertion: Either Brian is white, or John left the apple.