context: Chances are slight that John went to the garden. There is almost no chance that Greg is gray. It is probably not the case that Yann got the milk there. It is probably not the case that if Greg is gray, or Yann got the milk there, then Bill moved to the office. It is almost certain that if Yann got the milk there, or John went to the garden, then Sandra left the milk. There is a very good chance that if John went to the garden, or Yann got the milk there, then Brian is a lion.
hypothesis: It is improbable that brian is a lion, and John went to the garden.
valid_hypothesis: It is improbable that brian is a lion, and John went to the garden.
invalid_hypothesis: It is probable that brian is a lion, and John went to the garden.
hypothesis_assertion: Brian is a lion, and John went to the garden.