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$\frac{1}{a^{2}-ac-ab+bc}+\frac{2}{b^{2}-ab-bc+ac}+\frac{1}{c^{2}-ac-bc+ab}$

Find the value of the expression above when $a=1.3^{2},b=1.3^{2}+0.2^{2},c=0.7^{2}-0.1^{2}$.

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