context: There is little chance that Lily is a rhino. There is almost no chance that John dropped the apple. It is improbable that Fred went to the garden. It is probably not the case that if John dropped the apple, or Lily is a rhino, then Julius is a frog. It is impossible that if Lily is a rhino, or Fred went to the garden, then Mary picked up the milk. There is a better than even chance that if either Lily is a rhino, or John dropped the apple, then Brian is a swan.
hypothesis: It is highly unlikely that brian is a swan, and Lily is a rhino.
valid_hypothesis: It is highly unlikely that brian is a swan, and Lily is a rhino.
invalid_hypothesis: It is highly likely that brian is a swan, and Lily is a rhino.
hypothesis_assertion: Brian is a swan, and Lily is a rhino.