If the two lines
\[\begin{align}
\frac {x-1 }{k } &=\frac { y+1 }{2 } =z,\\
\\
\\
\frac {x+2 }{-3 } & =1-y =\frac{z+2}{k}
\end{align}\] are perpendicular to each other, then what is the value of \(k?\)

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