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the question is incorrect for case where we have the following input:
20 21
21 20
20 21
21 20
in this case 20 21 should be printed twice
applying distinct while selecting the rows will only print 20 21 once
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the question is incorrect for case where we have the following input: 20 21 21 20 20 21 21 20 in this case 20 21 should be printed twice applying distinct while selecting the rows will only print 20 21 once