After hearing a simple suit response, opener bids the next-highest suit if responder happened to bid his short suit. Responder is then expected to correct, if necessary, to a better fit.
After hearing a 2NT artificial response, opener bids his singleton/void suit at the three-level. Responder's rebids are natural.
Note that some partnerships use 2 ♦ instead of 2 ♣ for this hand type.
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