context: It is highly unlikely that Sandra left the apple. It is impossible that Brian is gray. We doubt that Bernhard is a lion. It is probably the case that if Sandra left the apple, and Bernhard is a lion, then Mary is in the cinema. It is impossible that if either Bernhard is a lion, or Sandra left the apple, then Jessica is a wolf. Chances are about even that if either Sandra left the apple, or Bernhard is a lion, then Bill went to the garden.
hypothesis: It is improbable that either Brian is gray, or Bill went to the garden.
valid_hypothesis: It is improbable that either Brian is gray, or Bill went to the garden.
invalid_hypothesis: It is almost certain that either Brian is gray, or Bill went to the garden.
hypothesis_assertion: Either Brian is gray, or Bill went to the garden.