B G D Kh L, M N S PH P, Z K R(Rh), A E I O U

: [403 bc] Greek Ionic alphabet of Miletus, which Athens adopted in 403 bc; Classical Greek alphabet of 22 letters.  The original scheme of Greek consisted of merely the thirteen consonants,[18] B.G.D.Kh.L., M.N.S.PH.P., Z.K.R(Rh), and five vowels, and was later expanded to include fifteen consonants, by including T.Th., the unvoiced and aspirate forms of letter D.  The Greeks later added the two letters X.Ps.  Cf. Dorian alphabet [1000 bc]. http://www.arapacana.com/glossary/misc/letters.html