context: Chances are slight that Gertrude is a mouse. It is impossible that Jeff went to the garden. It is impossible that Bernhard is gray. There is a very good chance that if Bernhard is gray, or Gertrude is a mouse, then Jessica is a wolf. It is unlikely that if either Gertrude is a mouse, or Bernhard is gray, then Julius is a rhino. It is probably the case that if Bernhard is gray, or Jeff went to the garden, then Greg is green.
hypothesis: It is impossible that julius is a rhino, and Greg is green.
valid_hypothesis: It is impossible that julius is a rhino, and Greg is green.
invalid_hypothesis: It is certain that julius is a rhino, and Greg is green.
hypothesis_assertion: Julius is a rhino, and Greg is green.