context: It is probably not the case that Bernhard is a rhino. It is certain that John went to the garden. We doubt that Greg is a swan.
hypothesis: Chances are about even that bernhard is a rhino, or Greg is a swan.
valid_hypothesis: Chances are about even that bernhard is a rhino, or Greg is a swan.
invalid_hypothesis: It is impossible that bernhard is a rhino, or Greg is a swan.
hypothesis_assertion: Bernhard is a rhino, or Greg is a swan.