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7
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| 6. : 1) ; 2) ; 3) ; 4) | 15. : 1) ; 2) ; 3) 4) |
| 7. : 1) ; 2) ; 3) ; 4) | 16. : 1) ; 2) ; 3) ; 4) |
| 8. : 1) ; 2) ; 3) ; 4) . | 17. : 1) ; 2) ; 3) ; 4) . |
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8
