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The AutoLISP routines in the AutoLISP Archive and those in other forums on the CADTutor Forum perform various tasks - see each topic for details.
Copyright is in the ownership of the various authors (details given in code headers). Please respect this copyright. The AutoLISP routines are free software but you may use them only in accordance with any expressly stated copyright conditions.
These routines are distributed in the hope that they will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.