context: It is probably not the case that Emily is a mouse. Chances are about even that Brian is gray. It is probably not the case that Lily is a swan. There is little chance that if either Lily is a swan, or Brian is gray, then Bernhard is gray. Chances are slight that if Brian is gray, or Emily is a mouse, then John put down the milk. It is improbable that if either Emily is a mouse, or Lily is a swan, then Mary moved to the office.
hypothesis: It is certain that brian is gray, or Mary moved to the office.
valid_hypothesis: Chances are about even that brian is gray, or Mary moved to the office.
invalid_hypothesis: It is certain that brian is gray, or Mary moved to the office.
hypothesis_assertion: Brian is gray, or Mary moved to the office.