a-a a-c aaa aac aae aam aas aax ac- aca acc ace acm acs acx aea aec aee aem aes aex ama amc ame amm ams amx as- asa asc ase asm ass asx ax- axa axe axm axs axx c-- caa cac cae cam cas cax cca ccc cce ccm ccs ccx ce- cea cec cee cem ces cex cma cmc cme cmm cms cmx csa csc cse csm css csx cxc cxs cxx eaa eac eae eam eas eax ec- eca ecc ece ecm ecs ecx eea eec eee eem ees eex em- ema emc eme emm ems emx es- esa esc ese esm ess esx ex- exa exc exe exs exx maa mac mae mam mas max mc- mca mcc mce mcm mcs mcx mea mec mee mem mes mex mma mmc mme mmm mms mmx msa msc mse msm mss msx mxa mxc mxs saa sac sae sam sas sax sca scc sce scm scs scx se- sea sec see sem ses sex sma smc sme smm sms smx ss- ssa ssc sse ssm sss ssx sxc sxm sxs xaa xac xam xas xcx xee xem xes xex xma xmc xmm xms xmx xsa xsc xsm xss xxx