context: It is impossible that Lily is a frog. There is a very good chance that Mary went to the bedroom. It is likely that Brian is white. Chances are about even that if Brian is white, and Mary went to the bedroom, then John got the milk. We believe that if Mary went to the bedroom, or Brian is white, then Julius is yellow. It is probable that if either Brian is white, or Lily is a frog, then Greg is a rhino.
hypothesis: Chances are about even that greg is a rhino, and Brian is white.
valid_hypothesis: Chances are about even that greg is a rhino, and Brian is white.
invalid_hypothesis: There is almost no chance that greg is a rhino, and Brian is white.
hypothesis_assertion: Greg is a rhino, and Brian is white.