Spline control points using autolisp

Hello, I'm working on a project using AutoLISP where i came to a point on how can i get spline control points after the first one.
say a 33 control point spline the first spline is given by (setq sp1_list (entget sp1)) (setq coord1 (cdr (assoc 10 sp1_list)))
how about rest of it or just last one
regards, Imran
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HiHo; You might read the code (spline2poly) by Tony Hotchkiss for "Dec03" at "get the code" www.cadalyst.com

i
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