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I've found the attached lisp that label contours.
the problem is that it for PLINE (x,y and Elevation)
I need help with changing it to work with 3DPOLYLINE (x,y,z), and the use the Z value of the first vertex of every line as the contour level value.
(actually, we can use any vertex of the contour line for the elevation value... I just thought it will be easier to use the first...)