	S -> SN SV
	SV -> v SN
	SV -> v
	SN -> det GN
	GN -> nom_com
	GN -> nom_prop
	det -> "el" | "la" | "los" | "las" | "un" | "una" | "unos" | "unas"
	nom_com -> "vecino" | "ladrones" | "mujeres" | "bosques" | "noche" | "flauta" | "ventana"
	nom_prop -> "Jose" | "Lucas" | "Pedro" | "Marta" 
	v -> "toca" | "moja" | "adoran" | "robaron" | "escondieron" | "rompió"
