Welcome to TheSwamp, Pockets.
I removed the lisp because it has a Copyright & expressly forbids it's posting without permission.
As for running it, It is part of a larger routine & can not be run without supporting lisp routines.
I believe that Gary has posted this routine here or maybe some others have posted a Stair routine.
I'll post the link if I find it before someone else post it.
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;;; Copyright © 2001 by Gary Davidson Fowler Architect
;;; Dallas, Texas
;;; Phone: 972.404.0182 email: gdfowler@hotmail.com
;;;
;;; Permission to use, copy, modify, and distribute this software
;;; for any purpose and without fee is NOT GRANTED without the
;;; written permission of Gary Davidson Fowler Architect.
;;;
;;; Gary Davidson Fowler PROVIDES THIS PROGRAM "AS IS" AND WITH ALL FAULTS.
;;; Gary Davidson Fowler SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTY OF
;;; MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. Gary Davidson Fowler
;;; DOES NOT WARRANT THAT THE OPERATION OF THE PROGRAM WILL BE
;;; UNINTERRUPTED OR ERROR FREE.
;;;
;;; Use, duplication, or disclosure by the U.S. Government is subject to
;;; restrictions set forth in FAR 52.227-19 (Commercial Computer
;;; Software - Restricted Rights) and DFAR 252.227-7013(c)(1)(ii)
;;; (Rights in Technical Data and Computer Software), as applicable.
;;;
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