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Python
def alternate(s): characters = sorted(list(set(s))) pairs = [] for i in range(len(characters)): for j in range(i + 1, len(characters)): pairs.append([characters[i], characters[j]]) newSlen = 0 for p in pairs: newS = [] for c in s: if c in p: newS.append(c) valid = 1 for i in range(1, len(newS)): if newS[i] == newS[i-1]: valid = 0 break if valid and len(newS) > newSlen: newSlen = len(newS) return newSlen
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Python