context: Chances are slight that Bernhard is a lion. There is a better than even chance that Brian is white. It is impossible that Julius is a swan. It is highly likely that if Julius is a swan, or Bernhard is a lion, then Bill dropped the milk. It is impossible that if Julius is a swan, and Bernhard is a lion, then Sandra left the milk. It is improbable that if either Julius is a swan, or Brian is white, then Emily is a sheep.
hypothesis: There is a better than even chance that either Sandra left the milk, or Brian is white.
valid_hypothesis: There is a better than even chance that either Sandra left the milk, or Brian is white.
invalid_hypothesis: It is improbable that either Sandra left the milk, or Brian is white.
hypothesis_assertion: Either Sandra left the milk, or Brian is white.