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[" 4."pi f_(q)" a,"b" site "c" altrifach fietlit at site firfulan "],[Delta=|[b+c,c+a,a+b],[c+a,a+b,b+c],[a+b,b+c,c+a]|=0],[" at "vec a" it azinizu for "a|" al "a+b+c=04a=b=cvec a|]

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