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Your program will be tested on one or more test cases. The first input line of a test case is an integer N which is the size of the grid. N input lines will follow, each line made of N integer values specifying the values in the grid in a row-major order. Note than 0 < N ≤ 1,000 and grid values are natural numbers less than or equal to 1,000,000.
The end of the test cases is identified with a dummy test case with N = 0.
For each test case, output the result on a single line using the following format:
Where k is the test case number (starting at 1), and result is "YES" or "NO" (without the double quotes.)
4 9 5 1 2 13 7 11 3 14 6 10 4 15 16 12 8 3 1 2 3 5 6 7 8 9 4 0
1. YES 2. NO
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