context: It is likely that Brian is white. It is probably the case that Sandra left the apple. There is a better than even chance that Lily is green. It is probable that if Sandra left the apple, and Brian is white, then Gertrude is a mouse. It is impossible that if either Sandra left the apple, or Lily is green, then Mary moved to the garden. We doubt that if either Lily is green, or Brian is white, then Fred is in the school.
hypothesis: It is impossible that either Brian is white, or Sandra left the apple.
valid_hypothesis: Chances are about even that either Brian is white, or Sandra left the apple.
invalid_hypothesis: It is impossible that either Brian is white, or Sandra left the apple.
hypothesis_assertion: Either Brian is white, or Sandra left the apple.