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[" (f "a^(2)+b^(2)+c^(2)-ab-bc-ca=0," th...

[" (f "a^(2)+b^(2)+c^(2)-ab-bc-ca=0," then "],[[" (a) "a=b!=c," (b) "a=b=c],[" (c) "a!=b=c," (d) "a!=b!=c]]

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