context: We doubt that Lily is a rhino. Chances are about even that Winona is a sheep. It is likely that Mary dropped the apple. Chances are slight that if Lily is a rhino, or Winona is a sheep, then Bernhard is a frog. It is highly unlikely that if Winona is a sheep, and Lily is a rhino, then Brian is gray. Chances are slight that if either Lily is a rhino, or Mary dropped the apple, then Greg is yellow.
hypothesis: It is impossible that greg is yellow, and Bernhard is a frog.
valid_hypothesis: It is impossible that greg is yellow, and Bernhard is a frog.
invalid_hypothesis: It is likely that greg is yellow, and Bernhard is a frog.
hypothesis_assertion: Greg is yellow, and Bernhard is a frog.