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The consonants are replaced by its immediate succeeding letter and vowels are replaced by its immediately preceding letter as per the English alphabetical series. For RIDER: P + 1 = Q A – 1 = Z R + 1 = S K + 1 = L E – 1 = D R + 1 = S Similarly, C + 1 = D A – 1 = Z R + 1 = S E – 1 = D E – 1 = D R + 1 = S
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