Get Random 2N Strings

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    Given a set of m strings, return a randomized array of 2n strings in which each element chosen to be in the array appears exactly twice. Assume n < m. For example, from [a,b,c,d] with n=3, return [c,d,a,a,c,d].

    List getRandom2NStrings (int n, Set<String> strings){

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