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# 3D Coordinate Geometry

Append a z-axis to the 2-dimensional plane and conquer the realm of 3-dimensional space.

Count the number of pairs of edges in the above cuboid that are skew.

Find the distance between the following two lines:

\[\begin{cases} l_1: x=-y=8-z \\\\ l_2: x=y \text{ and } z=-10. \end{cases}\]

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