\textbf{135-} What is the length of the common perpendicular of the two lines
$$\frac{x-1}{1} = \frac{y+2}{-1} = \frac{z}{3} \quad \text{and} \quad \begin{cases} x = 2y - 1 \\ z = 3y - 2 \end{cases}$$?
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(1) $\sqrt{3}$ \hfill (2) $\sqrt{6}$ \hfill (3) $2\sqrt{3}$ \hfill (4) $2\sqrt{6}$
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