Since a lexical item is a letter of the string alphabet, each production of a lexicalized grammar produces at least one letter of the generated string.
if we change the lexicalization construction as indicated before this example, then all the productions S δ (x 1 ) → A δ (δ , δ , x 1 ) are replaced by the productions S δ (x 1 ) → A(x 1 , δ).