-er a-a aaa aae aam aao aar aax aea aee aem aeo aer aex ama ame amm amo amr amx aoa aoe aom aoo aor aox ar- ara are arm aro arr arx ax- axa axe axm axo axr axx eaa eae eam eao ear eax eea eee eem eeo eer eex em- ema eme emm emo emr emx eo- eoa eoe eom eoo eor era ere erm ero err ex- exa exe exo exr exx m-o m-r maa mae mam mao mar max mea mee mem meo mer mex mma mme mmm mmo mmr mmx moa moe mom moo mor mox mra mre mrm mro mrr mrx mxa mxr oaa oae oam oao oar oax oea oee oem oeo oer oex om- oma ome omm omo omr omx oo- ooa oom ooo oor oox or- ora ore orm oro orr orx ox- oxa oxo oxx ra- raa rae ram rao rar rax re- rea ree rem reo rer rex rma rme rmm rmo rmr rmx roa roe rom roo ror rox rra rrm rrr rxr xaa xam xar xee xem xer xex xma xmm xmo xmr xmx xoa xom xoo xor xox xrx xxo xxx