Letters that make written language
a, e, g, l, n, r, t, i, u, w are letters that make 'written language'
Words within written language
LAN, language, age, IT, writ, AN, la, te, Ag, ANG, en, ng, RI, TT, ten, written, GU, LA, NGU, Ge, La, Te are words within 'written language'