context: It is impossible that Brian is a lion. Chances are about even that Emily is a cat. We believe that Gertrude is a mouse. It is probably the case that if either Gertrude is a mouse, or Brian is a lion, then Sandra dropped the milk. Chances are slight that if Emily is a cat, or Brian is a lion, then Bernhard is green. There is a very good chance that if either Emily is a cat, or Gertrude is a mouse, then Julius is a rhino.
hypothesis: Chances are about even that either Emily is a cat, or Brian is a lion.
valid_hypothesis: Chances are about even that either Emily is a cat, or Brian is a lion.
invalid_hypothesis: It is impossible that either Emily is a cat, or Brian is a lion.
hypothesis_assertion: Either Emily is a cat, or Brian is a lion.