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| from string import maketrans, ascii_lowercase as lc, ascii_uppercase as uc | |
| rots = [maketrans(lc + uc, lc[n:] + lc[:n] + uc[n:] + uc[:n]) for n in range(26)] | |
| def rot(s, n): return s.translate(rots[n % 26]) |
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