Patterned Palindromic Mirror-Sum Generator

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Double-Side Pattern only Show one of n and rev(n) Reject reversals with leading zero All digits of n different Exclude n when n is already palindromic Sum P has the same digit length as n

Double-Side Pattern: recognizes both repeated insertion (66 → 686 → 6886) and consecutive repeated digits (77 → 888 → 9999).

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