This raises a logical issue. Adding "-e" to one of these secondary stems produces an adjective that is structurally and semantically equivalent to the past participle of the same verb. "Experte", for example, is related to "experir" 'to experience', which has the past participle "experite". Yet, semantically, there is little difference between "un experte carpentero" 'an expert carpenter' and "un experite carpentero" 'an experienced carpenter'. Effectively, "experte" = "experite". Furthermore, one can form a word like "le experito" 'the experienced one' as a quasi-synonym of "le experto" 'the expert'.