Letters that make third-class mail
s, a, d, l, c, h, m, r, t, i are letters that make 'third-class mail'
Words within third-class mail
mail, hi, MA, la, ail, IR, lass, ma, cl, mA, SS, il, third, as, AI, ass, class, ai, AS, HI, IL, LA, As, Cl, Ir, La, Th are words within 'third-class mail'