a-a a-b aaa aab aae aam aao aas aax ab- aba abb abe abm abo abs abx aea aeb aee aem aeo aes aex ama amb ame amm amo ams amx aoa aob aoe aom aoo aos aox as- asa asb ase asm aso ass asx ax- axa axe axm axo axs axx baa bab bae bam bao bas bax bba bbb bbe bbm bbo bbs bbx be- bea beb bee bem beo bes bex bma bmb bme bmm bmo bms bmx boa bob boe bom boo bos box bsa bsb bse bsm bso bss bsx bxb bxm bxo bxx eaa eab eae eam eao eas eax eba ebb ebe ebm ebo ebs ebx eea eeb eee eem eeo ees eex em- ema emb eme emm emo ems emx eo- eoa eob eoe eom eoo eos es- esa esb ese esm eso ess esx ex- exa exe exo exs exx m-o maa mab mae mam mao mas max mba mbb mbe mbm mbo mbs mbx mea meb mee mem meo mes mex mma mmb mme mmm mmo mms mmx moa mob moe mom moo mos mox msa msb mse msm mso mss msx mxa mxs oaa oab oae oam oao oas oax ob- oba obb obe obm obo obs obx oea oeb oee oem oeo oes oex om- oma omb ome omm omo oms omx oo- ooa oob oom ooo oos oox os- osa osb ose osm oso oss osx ox- oxa oxb oxo oxx saa sab sae sam sao sas sax sba sbb sbe sbm sbo sbs sbx se- sea seb see sem seo ses sex sma smb sme smm smo sms smx soa sob soe som soo sos sox ss- ssa ssb sse ssm sso sss ssx sxm sxs xaa xam xas xbe xbx xee xem xes xex xma xmm xmo xms xmx xoa xom xoo xos xox xsa xsb xsm xss xxo xxx