context: It is probably not the case that Brian is a swan. It is highly likely that John dropped the apple. It is highly likely that Bernhard is a rhino. It is impossible that if either Bernhard is a rhino, or John dropped the apple, then Jessica is a mouse. It is probably not the case that if Bernhard is a rhino, and Brian is a swan, then Bill moved to the office. It is impossible that if Brian is a swan, and Bernhard is a rhino, then Greg is a frog.
hypothesis: It is impossible that either Brian is a swan, or Bernhard is a rhino.
valid_hypothesis: It is probable that either Brian is a swan, or Bernhard is a rhino.
invalid_hypothesis: It is impossible that either Brian is a swan, or Bernhard is a rhino.
hypothesis_assertion: Either Brian is a swan, or Bernhard is a rhino.