a-a a-c aaa aac aae aam aao aax ac- aca acc ace acm aco acx aea aec aee aem aeo aex ama amc ame amm amo amx aoa aoc aoe aom aoo aox ax- axa axe axm axo axx c-- caa cac cae cam cao cax cca ccc cce ccm cco ccx ce- cea cec cee cem ceo cex cma cmc cme cmm cmo cmx co- coa coc coe com coo cox cxc cxo cxx eaa eac eae eam eao eax ec- eca ecc ece ecm eco ecx eea eec eee eem eeo eex em- ema emc eme emm emo emx eo- eoa eoc eoe eom eoo ex- exa exc exe exo exx m-o maa mac mae mam mao max mc- mca mcc mce mcm mco mcx mea mec mee mem meo mex mma mmc mme mmm mmo mmx moa moc moe mom moo mox mxa mxc oaa oac oae oam oao oax oc- oca occ ocm oco ocx oea oec oee oem oeo oex om- oma omc ome omm omo omx oo- ooa ooc oom ooo oox ox- oxa oxc oxo oxx xaa xac xam xcx xee xem xex xma xmc xmm xmo xmx xoa xoc xom xoo xox xxo xxx