a-a a-b a-t aaa aab aae aag aam aan aas aat ab- aba abb abe abg abm abn abs abt aea aeb aee aeg aem aen aes aet ag- aga agb age agg agm agn ags agt ama amb ame amg amm amn ams amt an- ana anb ane ang anm ann ans ant as- asa asb ase asg asm asn ass ast at- ata atb ate atg atm atn ats att baa bab bae bag bam ban bas bat bba bbb bbe bbg bbm bbn bbs bbt be- bea beb bee beg bem ben bes bet bga bgb bge bgg bgm bgn bgs bgt bma bmb bme bmg bmm bmn bms bmt bna bnb bne bng bnn bns bnt bsa bsb bse bsg bsm bsn bss bst bta btb bte btg btm btn bts btt eaa eab eae eag eam ean eas eat eba ebb ebe ebg ebm ebn ebs ebt eea eeb eee eeg eem een ees eet ega egb ege egg egm egn egs egt em- ema emb eme emg emm emn ems emt en- ena enb ene eng enm enn ens ent es- esa esb ese esg esm esn ess est eta etb ete etg etm etn ets ett gaa gab gae gag gam gan gas gat gba gbe gbg gbm gbn gbs gbt ge- gea geb gee geg gem gen ges get gga ggb ggg ggm ggn ggs ggt gma gmb gme gmg gmm gmn gms gmt gna gnb gne gnm gnn gns gnt gsa gsb gse gsg gsm gsn gss gst gta gtb gte gtg gtm gtn gts gtt maa mab mae mag mam man mas mat mba mbb mbe mbg mbm mbs mbt mea meb mee meg mem men mes met mga mgb mge mgm mgn mgs mgt mma mmb mme mmg mmm mmn mms mmt mna mnb mne mng mnm mnn mns mnt msa msb mse msg msm msn mss mst mta mtb mte mtg mtm mtn mts mtt naa nab nae nag nam nan nas nat nba nbb nbe nbg nbm nbn nbs nbt ne- nea neb nee neg nem nen nes net nga ngb nge ngg ngm ngn ngs ngt nma nmb nme nmg nmm nmn nms nmt nna nnb nne nng nnm nnn nns nnt nsa nsb nse nsg nsm nsn nss nst nta ntb nte ntg ntm ntn nts ntt saa sab sae sag sam san sas sat sba sbb sbe sbg sbm sbn sbs sbt se- sea seb see seg sem sen ses set sga sgb sge sgg sgm sgn sgs sgt sma smb sme smg smm smn sms smt sna snb sne sng snm snn sns snt ss- ssa ssb sse ssg ssm ssn sss sst sta stb ste stg stm stn sts stt taa tab tae tag tam tan tas tat tba tbb tbe tbg tbm tbn tbs tbt te- tea teb tee teg tem ten tes tet tga tgb tge tgg tgm tgn tgs tgt tma tmb tme tmg tmm tmn tms tmt tna tnb tne tng tnm tnn tns tnt tsa tsb tse tsg tsm tsn tss tst tta ttb tte ttg ttm ttn tts ttt