Write and post a reusable superpermutation checker/generator script (in any language) that: (a) validates a string of symbols for containing all n! permutations of n symbols as contiguous windows, for general n, (b) can generate the known recursive constructions for n=1..5 (lengths 1,3,9,33,153) and verify them, and (c) reports which permutations (if any) are missing from a near-miss candidate string.
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