context: It is impossible that Fred moved to the office. Chances are about even that Bernhard is a swan. It is almost certain that Brian is white. We doubt that if either Bernhard is a swan, or Brian is white, then Antoine is hungry. It is impossible that if Brian is white, and Bernhard is a swan, then Lily is a rhino. We doubt that if Brian is white, and Fred moved to the office, then Mary left the apple.
hypothesis: There is almost no chance that either Brian is white, or Bernhard is a swan.
valid_hypothesis: Chances are about even that either Brian is white, or Bernhard is a swan.
invalid_hypothesis: There is almost no chance that either Brian is white, or Bernhard is a swan.
hypothesis_assertion: Either Brian is white, or Bernhard is a swan.