-ey a-a a-c aaa aac aae aah aax aay ac- aca acc ace ach acx acy aea aec aee aeh aex aey aha ahc ahe ahh ahx ahy ax- axa axe axh axx ay- aya ayc aye ayh ayx c-- caa cac cae cah cax cay cca ccc cce cch ccx ce- cea cec cee ceh cex cey ch- cha chc che chh chx chy cxc cxh cxx cya cyc cye eaa eac eae eah eax ec- eca ecc ece ech ecx eea eec eee eex eey eha ehc ehe ehh ex- exa exc exe exh exx exy eya eyc eye haa hac hae hah hax hay hca hcc hce hch hcy he- hea hec hee heh hex hey hha hhc hhe hhh hhy hxc hy- hya hyc hye hyh hyy xaa xac xch xcx xee xex xxx xxy xyy yaa yac yae yah yax yay yca ycc yce ych ycy yea yec yee yeh yex yey yha yhc yhe yxa yxe yxy yyc yye yyy