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In a certain code, the $$r^{th}$$ letter of the English alphabet is coded as $$r + 10(\equiv mod 26)^{th}$$ letter cyclically. For example, $$4^{th}$$ letter D is coded as $$14^{th}$$ letter N and $$24^{th}$$ letter X is coded as $$8^{th}$$ letter H (because $$r + 10(\equiv mod 26)$$). The reverse process is used for decoding. Basing on this coding and decoding, answer questions.
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