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$\large \sqrt{11 + \sqrt{21}}$

The above expression can be expressed as $\sqrt{\dfrac{a}{b}} + \sqrt{\dfrac{c}{d}}$, where $a,b,c$ and $d$ are positive integers with $\gcd(a,b) = \gcd(c,d) = 1$. Find $a+b+c+d$.

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