Keywords :
Context-free languages (CFL´s), Kleene star, local adjunct languages (LAL´s), push-down automata (pda´s), recursive generation of languages, regional adjunct languages (RAL´s), regular languages.; Arithmetic; Automata; Computer languages; Computer science; Natural languages; Context-free languages (CFL´s), Kleene star, local adjunct languages (LAL´s), push-down automata (pda´s), recursive generation of languages, regional adjunct languages (RAL´s), regular languages.;