context: It is highly unlikely that Bernhard is gray. There is a very good chance that Julius is a rhino. It is likely that Mary picked up the apple. We doubt that if Julius is a rhino, and Bernhard is gray, then Brian is a swan. It is impossible that if either Mary picked up the apple, or Bernhard is gray, then Sandra put down the milk. It is unlikely that if Julius is a rhino, and Mary picked up the apple, then Greg is a frog.
hypothesis: There is little chance that greg is a frog, or Brian is a swan.
valid_hypothesis: There is little chance that greg is a frog, or Brian is a swan.
invalid_hypothesis: It is probable that greg is a frog, or Brian is a swan.
hypothesis_assertion: Greg is a frog, or Brian is a swan.