a-a a-b aaa aab aae aag aam aao aas aax ab- aba abb abe abg abm abo abs abx aea aeb aee aeg aem aeo aes aex ag- aga agb age agg agm ago ags agx ama amb ame amg amm amo ams amx aoa aob aoe aog aom aoo aos aox as- asa asb ase asg asm aso ass asx ax- axa axe axm axo axs axx baa bab bae bag bam bao bas bax bba bbb bbe bbg bbm bbo bbs bbx be- bea beb bee beg bem beo bes bex bga bgb bge bgg bgm bgo bgs bgx bma bmb bme bmg bmm bmo bms bmx boa bob boe bog bom boo bos box bsa bsb bse bsg bsm bso bss bsx bxb bxm bxo bxx eaa eab eae eag eam eao eas eax eba ebb ebe ebg ebm ebo ebs ebx eea eeb eee eeg eem eeo ees eex ega egb ege egg egm ego egs egx em- ema emb eme emg emm emo ems emx eo- eoa eob eoe eog eom eoo eos es- esa esb ese esg esm eso ess esx ex- exa exe exo exs exx gaa gab gae gag gam gao gas gba gbe gbg gbm gbo gbs gbx ge- gea geb gee geg gem geo ges gex gga ggb ggg ggm ggo ggs gma gmb gme gmg gmm gmo gms gmx goa gob goe gog gom goo gos gox gsa gsb gse gsg gsm gso gss gsx gxa gxs m-o maa mab mae mag mam mao mas max mba mbb mbe mbg mbm mbo mbs mbx mea meb mee meg mem meo mes mex mga mgb mge mgm mgo mgs mgx mma mmb mme mmg mmm mmo mms mmx moa mob moe mog mom moo mos mox msa msb mse msg msm mso mss msx mxa mxs oaa oab oae oag oam oao oas oax ob- oba obb obe obg obm obo obs obx oea oeb oee oeg oem oeo oes oex oga oge ogg ogo ogs ogx om- oma omb ome omg omm omo oms omx oo- ooa oob oog oom ooo oos oox os- osa osb ose osg osm oso oss osx ox- oxa oxb oxo oxx saa sab sae sag sam sao sas sax sba sbb sbe sbg sbm sbo sbs sbx se- sea seb see seg sem seo ses sex sga sgb sge sgg sgm sgo sgs sgx sma smb sme smg smm smo sms smx soa sob soe sog som soo sos sox ss- ssa ssb sse ssg ssm sso sss ssx sxm sxs xaa xag xam xas xbe xbx xee xeg xem xes xex xge xma xmg xmm xmo xms xmx xoa xog xom xoo xos xox xsa xsb xsm xss xxo xxx