a-a aaa aae aam aas aax aea aee aem aes aex ama ame amm ams amx as- asa ase asm ass asx ax- axa axe axm axs axx eaa eae eam eas eax eea eee eem ees eex em- ema eme emm ems emx es- esa ese esm ess esx ex- exa exe exs exx maa mae mam mas max mea mee mem mes mex mma mme mmm mms mmx msa mse msm mss msx mxa mxs saa sae sam sas sax se- sea see sem ses sex sma sme smm sms smx ss- ssa sse ssm sss ssx sxm sxs xaa xam xas xee xem xes xex xma xmm xms xmx xsa xsm xss xxx