(Sort two-dimensional array) Write a method to sort a two-dimensional array using the following header:
public static void sort(int m[][])
The method performs a primary sort on rows and a secondary sort on columns.
For example, the following array
{{4, 2},{1, 7},{4, 5},{1, 2},{1, 1},{4, 1}}
will be sorted to
{{1, 1},{1, 2},{1, 7},{4, 1},{4, 2},{4, 5}}.
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