context: Chances are slight that Greg is white. It is probable that Julius is a swan. It is probably not the case that Mary went to the garden. It is impossible that if either Julius is a swan, or Mary went to the garden, then Jessica is a wolf. It is probable that if Mary went to the garden, and Julius is a swan, then John dropped the apple. We doubt that if either Mary went to the garden, or Julius is a swan, then Lily is a lion.
hypothesis: It is likely that either Julius is a swan, or Greg is white.
valid_hypothesis: It is likely that either Julius is a swan, or Greg is white.
invalid_hypothesis: It is highly unlikely that either Julius is a swan, or Greg is white.
hypothesis_assertion: Either Julius is a swan, or Greg is white.