context: It is almost certain that Fred went to the garden. It is probably the case that Lily is a swan. There is almost no chance that Julius is a swan. Chances are slight that if Julius is a swan, or Lily is a swan, then Greg is gray. It is probably not the case that if Julius is a swan, and Lily is a swan, then Bernhard is a rhino. There is a better than even chance that if Fred went to the garden, or Julius is a swan, then John moved to the office.
hypothesis: It is impossible that julius is a swan, and Greg is gray.
valid_hypothesis: It is impossible that julius is a swan, and Greg is gray.
invalid_hypothesis: It is almost certain that julius is a swan, and Greg is gray.
hypothesis_assertion: Julius is a swan, and Greg is gray.