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Here is my Python solution!
def alternate(s): lens = [0] letters = list(set(list(s))) for letter1 in range(len(letters)): for letter2 in range(letter1 + 1, len(letters)): two = [] for letter in s: if letter == letters[letter1]: if two: if two[-1] == letters[letter2]: two.append(letter) else: two = [] break else: two.append(letter) elif letter == letters[letter2]: if two: if two[-1] == letters[letter1]: two.append(letter) else: two = [] break else: two.append(letter) lens.append(len(two)) return max(lens)
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Here is my Python solution!