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Portions of code (in vle-extension.lsp) and ideas were gratefully taken from :

Lee Mac Programming, http://www.lee-mac.com

Lee Mac Programming is well-known and respected in AutoLISP programmers community for his competence and generosity providing great AutoLISP code to developers. So we are very glad to cooperate in the context of emulating this VLE Function Library as AutoLISP code.
For any VLE function using code provided by Lee Mac Programming a dedicated note is given in the function description, in both vle-extension.lsp file and this documentation.