Let \[f(x) =
\left\{
\begin{array}{ll}
\frac{x^2-x-2}{x-2} & \mbox{if } x \neq 2 \\
a & \mbox{if } x = 2.
\end{array}
\right.\]
If \(f(x)\) is continuous for all real values of \(x,\) what is \(a?\)

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