context: It is probably the case that Bernhard is a swan. It is highly unlikely that Mary moved to the office. There is little chance that Brian is a lion. It is highly likely that if either Mary moved to the office, or Brian is a lion, then Greg is a rhino. There is a better than even chance that if Mary moved to the office, and Bernhard is a swan, then Lily is green. It is probably the case that if Mary moved to the office, or Bernhard is a swan, then Julius is white.
hypothesis: It is impossible that either Brian is a lion, or Julius is white.
valid_hypothesis: Chances are about even that either Brian is a lion, or Julius is white.
invalid_hypothesis: It is impossible that either Brian is a lion, or Julius is white.
hypothesis_assertion: Either Brian is a lion, or Julius is white.