Question: MergeSort originally merges exactly 2 equal - length sorted arrays at the final Combine step as in Divide and Conquer, which we denote as Merge

MergeSort originally merges exactly 2 equal-length sorted arrays at the final Combine step as in Divide and Conquer, which we denote as Merge2(). However, per request we now want to split the input array in 3 equal subarrays and then recursively call MergeSort on all 3 subarrays.
We then need to implement a new merge operation Merge 3() to combine 3 sorted subarrays.

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