  =  

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 (, , ) =  (4 .) (, , )

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 (4 .) = 

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 (2 .) =  (4 .)

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 +  =  (4 .)

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 (8 .) = 

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 (6 .) = 

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 (6 .) =  (3 .)

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 (8 .) = 

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 (3 .) +  (3 .) = 