context: Chances are about even that Greg is a swan. It is highly unlikely that Mary left the apple. There is a very good chance that Lily is a lion.
hypothesis: It is impossible that either Greg is a swan, or Lily is a lion.
valid_hypothesis: Chances are about even that either Greg is a swan, or Lily is a lion.
invalid_hypothesis: It is impossible that either Greg is a swan, or Lily is a lion.
hypothesis_assertion: Either Greg is a swan, or Lily is a lion.