Check which ports are open to the outside world. Helps make sure that your firewall rules are working as intended.
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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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