context: Chances are about even that Sandra dropped the milk. It is impossible that Bernhard is gray. There is little chance that Greg is a frog.
hypothesis: It is impossible that bernhard is gray, and Greg is a frog.
valid_hypothesis: It is impossible that bernhard is gray, and Greg is a frog.
invalid_hypothesis: It is probable that bernhard is gray, and Greg is a frog.
hypothesis_assertion: Bernhard is gray, and Greg is a frog.