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$\large \frac{ab+1}{(a+b)^2} + \frac{bc+1}{(b+c)^2} + \frac{ca+1}{(c+a)^2}$

Positive real numbers $a$, $b$ and $c$ are such that $a^2 + b^2 + c^2 + (a+b+c)^2 \le 4$. Find the minimum value of the expression above.

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