context: It is unlikely that Greg is green. It is impossible that Brian is a swan. There is almost no chance that Bernhard is gray. It is probably not the case that if Greg is green, and Bernhard is gray, then Sandra got the football. It is unlikely that if either Greg is green, or Brian is a swan, then Mary went to the office. It is highly unlikely that if Greg is green, or Bernhard is gray, then Julius is a frog.
hypothesis: It is impossible that bernhard is gray, and Julius is a frog.
valid_hypothesis: It is impossible that bernhard is gray, and Julius is a frog.
invalid_hypothesis: Chances are about even that bernhard is gray, and Julius is a frog.
hypothesis_assertion: Bernhard is gray, and Julius is a frog.