context: We believe that Emily is a cat. We believe that Lily is a swan. It is probable that Sandra dropped the milk. There is a better than even chance that if Sandra dropped the milk, or Emily is a cat, then Bernhard is white. There is a better than even chance that if Lily is a swan, or Emily is a cat, then Julius is yellow. It is impossible that if Lily is a swan, and Emily is a cat, then Jessica is a wolf.
hypothesis: It is impossible that either Lily is a swan, or Bernhard is white.
valid_hypothesis: Chances are about even that either Lily is a swan, or Bernhard is white.
invalid_hypothesis: It is impossible that either Lily is a swan, or Bernhard is white.
hypothesis_assertion: Either Lily is a swan, or Bernhard is white.