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1. , , , 9 3 .

2. 9.

3. 9 19.

4. 7 13.

5. 2, 3, 4, 5, 7, 9 .

6. 2, 3, 4, 5, 6, 7, 8, 9, 11, 13 .

7. , ,

8. - .

, .

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