context: It is almost certain that Bernhard is a swan. It is highly likely that Greg is a frog. Chances are about even that John put down the milk. There is little chance that if either Greg is a frog, or John put down the milk, then Jeff went to the kitchen. It is likely that if Greg is a frog, or Bernhard is a swan, then Brian is gray. It is likely that if either Greg is a frog, or Bernhard is a swan, then Mary moved to the office.
hypothesis: There is a very good chance that brian is gray, and John put down the milk.
valid_hypothesis: It is probably not the case that brian is gray, and John put down the milk.
invalid_hypothesis: There is a very good chance that brian is gray, and John put down the milk.
hypothesis_assertion: Brian is gray, and John put down the milk.