Benjamin Two Bids
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2C shows a normal Acol two bid: 8+ playing tricks, good suit, 
four or more defensive tricks, and forcing for one round. 2D 
is the artificial negative. Over a suit rebid, 2NT is the 
negative. Responder may pass if opener rebids their suit. 

2D opening shows a balanced 23+ hand or a game-forcing hand. 
2H is the artificial negative. 

2H and 2S are weak two bids.