context: Chances are about even that Brian is a lion. It is certain that Lily is a swan. It is unlikely that Mary put down the milk.
hypothesis: It is highly unlikely that either Mary put down the milk, or Lily is a swan.
valid_hypothesis: There is a very good chance that either Mary put down the milk, or Lily is a swan.
invalid_hypothesis: It is highly unlikely that either Mary put down the milk, or Lily is a swan.
hypothesis_assertion: Either Mary put down the milk, or Lily is a swan.