a-a a-b a-t aaa aab aae aag aan aas aat ab- aba abb abe abg abn abs abt aea aeb aee aeg aen aes aet ag- aga agb age agg agn ags agt an- ana anb ane ang ann ans ant as- asa asb ase asg asn ass ast at- ata atb ate atg atn ats att baa bab bae bag ban bas bat bba bbb bbe bbg bbn bbs bbt be- bea beb bee beg ben bes bet bga bgb bge bgg bgn bgs bgt bna bnb bne bng bnn bns bnt bsa bsb bse bsg bsn bss bst bta btb bte btg btn bts btt eaa eab eae eag ean eas eat eba ebb ebe ebg ebn ebs ebt eea eeb eee eeg een ees eet ega egb ege egg egn egs egt en- ena enb ene eng enn ens ent es- esa esb ese esg esn ess est eta etb ete etg etn ets ett gaa gab gae gag gan gas gat gba gbe gbg gbn gbs gbt ge- gea geb gee geg gen ges get gga ggb ggg ggn ggs ggt gna gnb gne gnn gns gnt gsa gsb gse gsg gsn gss gst gta gtb gte gtg gtn gts gtt naa nab nae nag nan nas nat nba nbb nbe nbg nbn nbs nbt ne- nea neb nee neg nen nes net nga ngb nge ngg ngn ngs ngt nna nnb nne nng nnn nns nnt nsa nsb nse nsg nsn nss nst nta ntb nte ntg ntn nts ntt saa sab sae sag san sas sat sba sbb sbe sbg sbn sbs sbt se- sea seb see seg sen ses set sga sgb sge sgg sgn sgs sgt sna snb sne sng snn sns snt ss- ssa ssb sse ssg ssn sss sst sta stb ste stg stn sts stt taa tab tae tag tan tas tat tba tbb tbe tbg tbn tbs tbt te- tea teb tee teg ten tes tet tga tgb tge tgg tgn tgs tgt tna tnb tne tng tnn tns tnt tsa tsb tse tsg tsn tss tst tta ttb tte ttg ttn tts ttt