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A plot in three dimensions that includes points labeled
\(P=(x_0, y_0, z_0)\) and
\(Q=(x_1, y_1, z_1)\) a segment connecting these in blue.Additionally, there is a box of connecting segments each coordinate direction. The point on the box with a change only in the x-coordinate from P is labeled S. The vertex of the box that is below Q and connected to point S is connected by a segment that only changes in the y coordinate.