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1,2 - 3,4 - 1,2 .. /2 (. 16,) uab . . /2, .

 

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(. 16,) , . 18,, 1, 2, 3, 4, 5, 6. , , , , - . U = 1 R=R=R=R=1.

 

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. 18. () ()

I - VI , . 18,. , . 18,. 180 , .. , , , .. 1/2 180 . ; , .

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. 19. () () I

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