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How many strings are there over the set {a, b, c} that have length 10 in which no two consecutive characters are the same? For

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How many strings are there over the set {a, b, c} that have length 10 in which no two consecutive characters are the same? For example, the string "abcbcbabcb" would count and the strings "abbbcbabcb" and "aacbcbabcb" would not count

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