Interessante para implementar backtracking, por exemplo.
REFS: [1] http://www.cis.upenn.edu/~screamer-tools/screamer-intro.html -- Vilson Vieira da Silva, Jr. a.k.a mov http://vilson.void.cc ~ [EMAIL PROTECTED] _______________________________________________ Users mailing list [email protected] http://lists.lisp-br.org/cgi-bin/mailman/listinfo/users
