Below is a table of numbers with 5 rows and 5 columns. From the table, choose 5 numbers in such a way that no two numbers come from the same row and no two numbers come from the same column. Find the sum of these 5 numbers. Explain the result.

7 8 5 9 10

6 7 4 8 9

9 10 7 11 12

8 9 6 10 11

4 5 2 6 7

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