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public String concatSecondToLastLetters(String a, String b)
 concatSecondToLastLetters("hOw", "nOw") → "OO" concatSecondToLastLetters("whAt", "thEn") → "AE" concatSecondToLastLetters("fuLl", "moOn") → "LO" ...Save, Compile, Run (ctrl-enter)  | 
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Difficulty: 12
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