we have proven that the computational time complexity of  mergesort is O(n * log2n). Perhaps the time complexity of mergesort can be improved further by  separating the array into three parts instead of two. Start by implementing a method called merge3. This method should take three sorted arrays as  inputs and return a sorted array consisting of all elements of the three input arrays.   public static int[] merge3(int[] a, int[] b, int[] c) {         return new int[] {-1};     }

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