context: There is little chance that Yann is tired. It is impossible that Greg is a swan. It is likely that Brian is white.
hypothesis: It is highly likely that either Greg is a swan, or Yann is tired.
valid_hypothesis: It is improbable that either Greg is a swan, or Yann is tired.
invalid_hypothesis: It is highly likely that either Greg is a swan, or Yann is tired.
hypothesis_assertion: Either Greg is a swan, or Yann is tired.