context: It is probably the case that Brian is a swan. It is highly likely that Bernhard is a lion. There is a better than even chance that Fred discarded the milk. It is improbable that if Brian is a swan, or Bernhard is a lion, then Julius is green. It is probably not the case that if either Brian is a swan, or Fred discarded the milk, then Mary moved to the garden. We believe that if either Bernhard is a lion, or Brian is a swan, then Lily is a frog.
hypothesis: It is probably the case that either Mary moved to the garden, or Brian is a swan.
valid_hypothesis: It is probably the case that either Mary moved to the garden, or Brian is a swan.
invalid_hypothesis: It is improbable that either Mary moved to the garden, or Brian is a swan.
hypothesis_assertion: Either Mary moved to the garden, or Brian is a swan.