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1. 7 , 2. 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 3. 2 3 4 52 3 4 5 2 3 4 5 2 3 4 5 2 3 4 5 4. 14-16 . 2 4 6 82 4 6 8 2 4 6 8 2 4 6 8 2 4 6 8
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