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[|[1+a,1,1],[1,1+b,1],[1,1,1+c]|=(abc)((...

[|[1+a,1,1],[1,1+b,1],[1,1,1+c]|=(abc)((1)/(a)+(1)/(b)+(1)/(c)+1)],[,=(bc+ca+ab+abc)],[,quad quad (" UP "2004]

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