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The latter seems better as opener can introduce hearts with four over 2D or responder can bid hearts later with five. If responder follows up 2D with 3C, that is not forcing, but other bids are forcing. 2D, then 2NT, is forcing only as far as 3C, but rebids beyond 3C are forcing to game. Responder’s jumps to 3D and 3H over 2C are game-forcing splinters agreeing clubs. Similarly: 1C-1H; 2C-2S ... ................
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