context: It is likely that Brian is a lion. It is highly unlikely that John went to the hallway. Chances are slight that Mary moved to the office. There is little chance that if Brian is a lion, and Mary moved to the office, then Yann is tired. It is improbable that if Mary moved to the office, and Brian is a lion, then Julius is a swan. Chances are about even that if Brian is a lion, and Mary moved to the office, then Bernhard is gray.
hypothesis: It is highly unlikely that either Bernhard is gray, or Yann is tired.
valid_hypothesis: It is highly unlikely that either Bernhard is gray, or Yann is tired.
invalid_hypothesis: There is a very good chance that either Bernhard is gray, or Yann is tired.
hypothesis_assertion: Either Bernhard is gray, or Yann is tired.