context: It is probable that Greg is white. Chances are slight that Brian is a swan. It is probably not the case that John went to the office. It is impossible that if either Brian is a swan, or John went to the office, then Julius is green. It is probable that if John went to the office, or Greg is white, then Fred left the milk. There is a better than even chance that if John went to the office, or Brian is a swan, then Mary dropped the apple.
hypothesis: It is unlikely that either Julius is green, or Greg is white.
valid_hypothesis: It is probable that either Julius is green, or Greg is white.
invalid_hypothesis: It is unlikely that either Julius is green, or Greg is white.
hypothesis_assertion: Either Julius is green, or Greg is white.