context: There is a better than even chance that Fred is in the park. It is probably not the case that Bernhard is a lion. We doubt that Brian is a frog. It is unlikely that if Fred is in the park, and Brian is a frog, then Sandra put down the milk. Chances are about even that if either Fred is in the park, or Bernhard is a lion, then Sumit is thirsty. There is almost no chance that if either Brian is a frog, or Bernhard is a lion, then John took the football.
hypothesis: It is improbable that fred is in the park, or Brian is a frog.
valid_hypothesis: It is likely that fred is in the park, or Brian is a frog.
invalid_hypothesis: It is improbable that fred is in the park, or Brian is a frog.
hypothesis_assertion: Fred is in the park, or Brian is a frog.