context: It is probably the case that Emily is a mouse. Chances are slight that Brian is a swan. It is almost certain that Mary went to the garden. It is improbable that if Emily is a mouse, and Brian is a swan, then Daniel got the football. It is probable that if Emily is a mouse, or Mary went to the garden, then Lily is a rhino. It is probable that if Brian is a swan, or Mary went to the garden, then Gertrude is a wolf.
hypothesis: There is little chance that either Brian is a swan, or Lily is a rhino.
valid_hypothesis: It is probable that either Brian is a swan, or Lily is a rhino.
invalid_hypothesis: There is little chance that either Brian is a swan, or Lily is a rhino.
hypothesis_assertion: Either Brian is a swan, or Lily is a rhino.