context: We doubt that Lily is a swan. It is probable that Greg is a swan. We doubt that Bernhard is a lion.
hypothesis: There is a better than even chance that either Greg is a swan, or Lily is a swan.
valid_hypothesis: There is a better than even chance that either Greg is a swan, or Lily is a swan.
invalid_hypothesis: There is little chance that either Greg is a swan, or Lily is a swan.
hypothesis_assertion: Either Greg is a swan, or Lily is a swan.