context: There is little chance that John picked up the milk. It is improbable that Lily is a frog. We believe that Winona is a mouse. Chances are about even that if either John picked up the milk, or Winona is a mouse, then Bernhard is white. There is a very good chance that if Winona is a mouse, or Lily is a frog, then Brian is green. It is unlikely that if Lily is a frog, and Winona is a mouse, then Mary went to the bedroom.
hypothesis: It is impossible that mary went to the bedroom, and John picked up the milk.
valid_hypothesis: It is impossible that mary went to the bedroom, and John picked up the milk.
invalid_hypothesis: We believe that mary went to the bedroom, and John picked up the milk.
hypothesis_assertion: Mary went to the bedroom, and John picked up the milk.