a-a a-b a-t aaa aab aae aag aak aan aas aat ab- aba abb abe abg abk abn abs abt aea aeb aee aeg aek aen aes aet ag- aga agb age agg agk agn ags agt aka akb ake akg akk akn aks an- ana anb ane ang ank ann ans ant as- asa asb ase asg ask asn ass ast at- ata atb ate atg atn ats att baa bab bae bag bak ban bas bat bba bbb bbe bbg bbk bbn bbs bbt be- bea beb bee beg bek ben bes bet bga bgb bge bgg bgk bgn bgs bgt bka bkb bke bkg bkk bkn bks bkt bna bnb bne bng bnk bnn bns bnt bsa bsb bse bsg bsk bsn bss bst bta btb bte btg btk btn bts btt eaa eab eae eag eak ean eas eat eba ebb ebe ebg ebk ebn ebs ebt eea eeb eee eeg eek een ees eet ega egb ege egg egn egs egt eka ekb eke ekg eks ekt en- ena enb ene eng enk enn ens ent es- esa esb ese esg esk esn ess est eta etb ete etg etk etn ets ett gaa gab gae gag gak gan gas gat gba gbe gbg gbk gbn gbs gbt ge- gea geb gee geg gek gen ges get gga ggb ggg ggn ggs ggt gka gkb gkn gks gkt gna gnb gne gnn gns gnt gsa gsb gse gsg gsk gsn gss gst gta gtb gte gtg gtk gtn gts gtt k-t ka- kaa kab kae kag kak kan kas kat kba kbb kbe kbk kbn kbs ke- kea keb kee keg kek ken kes ket kga kgb kgs kkb kke kkk kkn kks kkt kn- kna kne kng knk knn knt ksa ksb kse ksg ksk ksn kss kst kta ktb kte ktg ktk ktn kts ktt naa nab nae nag nak nan nas nat nba nbb nbe nbg nbk nbn nbs nbt ne- nea neb nee neg nek nen nes net nga ngb nge ngg ngk ngn ngs ngt nka nke nkk nkn nks nkt nna nnb nne nng nnk nnn nns nnt nsa nsb nse nsg nsk nsn nss nst nta ntb nte ntg ntk ntn nts ntt saa sab sae sag sak san sas sat sba sbb sbe sbg sbk sbn sbs sbt se- sea seb see seg sek sen ses set sga sgb sge sgg sgk sgn sgs sgt sk- ska skb ske skg skk sks skt sna snb sne sng snk snn sns snt ss- ssa ssb sse ssg ssk ssn sss sst sta stb ste stg stk stn sts stt taa tab tae tag tak tan tas tat tba tbb tbe tbg tbk tbn tbs tbt te- tea teb tee teg tek ten tes tet tga tgb tge tgg tgk tgn tgs tgt tka tkb tke tkg tkk tks tkt tna tnb tne tng tnk tnn tns tnt tsa tsb tse tsg tsk tsn tss tst tta ttb tte ttg ttk ttn tts ttt