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External sorting problem 1 Given two files A and B and each file includes 4 pages (each page contains 4 entries only) as shown as the following: A: [1,4,2, 41, [5,2,18,9], [28,7,16,51, [13, 14, 11, 12]] B: [I9,5,2,1], [25,5, 31, 0], (45, 33, 12, 16], [19, 13, 16, 21]] Assume you have 3 buffer pages in main memory, show the "external sort" procedure for the given example