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BEC %E0%B8%AB%E0%B8%A3%E0%B8%B7%E0%B8%AD Building Energy Code %E0%B8%84%E0%B8%B7%E0%B8%AD%E0%B8%AD%E0%B8%B0%E0%B9%84%E0%B8%A3