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" 20."|[b^(2)c^(2),bc,b+c],[c^(2)a^(2),c...

" 20."|[b^(2)c^(2),bc,b+c],[c^(2)a^(2),ca,c+a],[a^(2)b^(2),ab,a+b]|=0

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|[b^(2)c^(2),bc,a-c],[c^(2)a^(2),ca,b-c],[a^(2)b^(2),ab,0]|=?

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