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https://www.youtube.com/watch?v=UttY15vRki8&li...EMnrcHAI6MDyBxlSp8WAsU9W2rmI8g
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3: 1 , 1 , 1 , 1 , 1 .
4 : 5 , 5 , 1 .
5: 3 , 3 , 2 .
6: 2 , 2 , 1 .
7: 2 , 2 .
8: 3 , 2 .
9: 2 , 2 , 1 .
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