context: It is probably not the case that Mary went to the hallway. Chances are slight that Greg is gray. Chances are about even that John discarded the milk. It is highly likely that if either John discarded the milk, or Greg is gray, then Sandra left the apple. It is almost certain that if John discarded the milk, and Mary went to the hallway, then Julius is a rhino. It is improbable that if John discarded the milk, and Mary went to the hallway, then Bernhard is a lion.
hypothesis: There is little chance that either Julius is a rhino, or Bernhard is a lion.
valid_hypothesis: There is little chance that either Julius is a rhino, or Bernhard is a lion.
invalid_hypothesis: It is probable that either Julius is a rhino, or Bernhard is a lion.
hypothesis_assertion: Either Julius is a rhino, or Bernhard is a lion.