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Warmup-2 > last2
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Given a string, return the count of the number of times that a substring length 2 appears in the string and also as the last 2 chars of the string, so "hixxxhi" yields 1 (we won't count the end substring).

last2("hixxhi") → 1
last2("xaxxaxaxx") → 1
last2("axxxaaxx") → 2

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public int last2(String str) { }


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