-ey a-a a-b aaa aab aae aau aax aay ab- aba abb abe abu abx aby aea aeb aee aeu aex aey au- aua aub aue aux ax- axa axe axx ay- aya aye ayu ayx b-u baa bab bae bau bax bay bba bbb bbe bbu bbx bby be- bea beb bee beu bex bey bua bub bue buu bux buy bxb bxx by- bya bye byu eaa eab eae eau eax eba ebb ebe ebu ebx eby eea eeb eee eex eey eu- eua eub eue eux ex- exa exe exu exx exy eya eye ua- uaa uab uae uau uay uba ubb ube ubu ubx uby uea ueb uee uey uua uue uuu uxb uxu uyu xaa xau xbe xbx xee xeu xex xue xxx xxy xyy yaa yab yae yau yax yay ybe yby yea yeb yee yex yey yua yue yuu yux yuy yxa yxe yxy yyb yye yyu yyy