a-a a-b aaa aab aae aag aak aam aan aas ab- aba abb abe abg abk abm abn abs aea aeb aee aeg aek aem aen aes ag- aga agb age agg agk agm agn ags aka akb ake akg akk akm akn aks ama amb ame amg amk amm amn ams an- ana anb ane ang ank anm ann ans as- asa asb ase asg ask asm asn ass baa bab bae bag bak bam ban bas bba bbb bbe bbg bbk bbm bbn bbs be- bea beb bee beg bek bem ben bes bga bgb bge bgg bgk bgm bgn bgs bka bkb bke bkg bkk bkm bkn bks bma bmb bme bmg bmk bmm bmn bms bna bnb bne bng bnk bnn bns bsa bsb bse bsg bsk bsm bsn bss eaa eab eae eag eak eam ean eas eba ebb ebe ebg ebk ebm ebn ebs eea eeb eee eeg eek eem een ees ega egb ege egg egm egn egs eka ekb eke ekg eks em- ema emb eme emg emk emm emn ems en- ena enb ene eng enk enm enn ens es- esa esb ese esg esk esm esn ess gaa gab gae gag gak gam gan gas gba gbe gbg gbk gbm gbn gbs ge- gea geb gee geg gek gem gen ges gga ggb ggg ggm ggn ggs gka gkb gkm gkn gks gma gmb gme gmg gmm gmn gms gna gnb gne gnm gnn gns gsa gsb gse gsg gsk gsm gsn gss ka- kaa kab kae kag kak kam kan kas kba kbb kbe kbk kbm kbn kbs ke- kea keb kee keg kek kem ken kes kga kgb kgm kgs kkb kke kkk kkm kkn kks kma kmb kme kmg kmk kmm kms kn- kna kne kng knk knm knn ksa ksb kse ksg ksk ksm ksn kss maa mab mae mag mak mam man mas mba mbb mbe mbg mbk mbm mbs mea meb mee meg mek mem men mes mga mgb mge mgk mgm mgn mgs mka mkb mke mkg mkk mkm mkn mks mma mmb mme mmg mmk mmm mmn mms mna mnb mne mng mnk mnm mnn mns msa msb mse msg msk msm msn mss naa nab nae nag nak nam nan nas nba nbb nbe nbg nbk nbm nbn nbs ne- nea neb nee neg nek nem nen nes nga ngb nge ngg ngk ngm ngn ngs nka nke nkk nkm nkn nks nma nmb nme nmg nmk nmm nmn nms nna nnb nne nng nnk nnm nnn nns nsa nsb nse nsg nsk nsm nsn nss saa sab sae sag sak sam san sas sba sbb sbe sbg sbk sbm sbn sbs se- sea seb see seg sek sem sen ses sga sgb sge sgg sgk sgm sgn sgs sk- ska skb ske skg skk skm sks sma smb sme smg smk smm smn sms sna snb sne sng snk snm snn sns ss- ssa ssb sse ssg ssk ssm ssn sss