a-a a-b a-c a-t aaa aab aac aae aag aak aan aas aat ab- aba abb abc abe abg abk abn abs abt ac- aca acb acc ace acg ack acn acs act aea aeb aec aee aeg aek aen aes aet ag- aga agb agc age agg agk agn ags agt aka akb akc ake akg akk akn aks an- ana anb anc ane ang ank ann ans ant as- asa asb asc ase asg ask asn ass ast at- ata atb atc ate atg atn ats att baa bab bac bae bag bak ban bas bat bba bbb bbc bbe bbg bbk bbn bbs bbt bca bcb bcc bce bcg bck bcn bcs bct be- bea beb bec bee beg bek ben bes bet bga bgb bgc bge bgg bgk bgn bgs bgt bka bkb bkc bke bkg bkk bkn bks bkt bna bnb bnc bne bng bnk bnn bns bnt bsa bsb bsc bse bsg bsk bsn bss bst bta btb btc bte btg btk btn bts btt c-- caa cab cac cae cag cak can cas cat cba cbb cbc cbe cbg cbk cbn cbs cbt cca ccb ccc cce ccg cck ccn ccs cct ce- cea ceb cec cee ceg cek cen ces cet cga cgb cgc cge cgg cgn cgs cgt cka ckb ckc cks ckt cn- cna cnb cnc cne cng cnn cns cnt csa csb csc cse csg csk csn css cst cta ctb ctc cte ctg ctk ctn cts ctt eaa eab eac eae eag eak ean eas eat eba ebb ebc ebe ebg ebk ebn ebs ebt ec- eca ecb ecc ece ecg eck ecn ecs ect eea eeb eec eee eeg eek een ees eet ega egb egc ege egg egn egs egt eka ekb ekc eke ekg eks ekt en- ena enb enc ene eng enk enn ens ent es- esa esb esc ese esg esk esn ess est eta etb etc ete etg etk etn ets ett gaa gab gac gae gag gak gan gas gat gba gbc gbe gbg gbk gbn gbs gbt gca gcb gcc gce gcg gck gcn gcs gct ge- gea geb gec gee geg gek gen ges get gga ggb ggc ggg ggn ggs ggt gka gkb gkn gks gkt gna gnb gnc gne gnn gns gnt gsa gsb gsc gse gsg gsk gsn gss gst gta gtb gtc gte gtg gtk gtn gts gtt k-t ka- kaa kab kac kae kag kak kan kas kat kba kbb kbc kbe kbk kbn kbs kca kcb kcc kce kcg kck kcn kcs kct ke- kea keb kec kee keg kek ken kes ket kga kgb kgc kgs kkb kkc kke kkk kkn kks kkt kn- kna knc kne kng knk knn knt ksa ksb ksc kse ksg ksk ksn kss kst kta ktb ktc kte ktg ktk ktn kts ktt naa nab nac nae nag nak nan nas nat nba nbb nbc nbe nbg nbk nbn nbs nbt nca ncb ncc nce ncg nck ncn ncs nct ne- nea neb nec nee neg nek nen nes net nga ngb ngc nge ngg ngk ngn ngs ngt nka nkc nke nkk nkn nks nkt nna nnb nnc nne nng nnk nnn nns nnt nsa nsb nsc nse nsg nsk nsn nss nst nta ntb ntc nte ntg ntk ntn nts ntt saa sab sac sae sag sak san sas sat sba sbb sbc sbe sbg sbk sbn sbs sbt sca scb scc sce scg sck scn scs sct se- sea seb sec see seg sek sen ses set sga sgb sgc sge sgg sgk sgn sgs sgt sk- ska skb skc ske skg skk sks skt sna snb snc sne sng snk snn sns snt ss- ssa ssb ssc sse ssg ssk ssn sss sst sta stb stc ste stg stk stn sts stt taa tab tac tae tag tak tan tas tat tba tbb tbc tbe tbg tbk tbn tbs tbt tca tcb tcc tce tcg tck tcn tcs tct te- tea teb tec tee teg tek ten tes tet tga tgb tgc tge tgg tgk tgn tgs tgt tka tkb tkc tke tkg tkk tks tkt tna tnb tnc tne tng tnk tnn tns tnt tsa tsb tsc tse tsg tsk tsn tss tst tta ttb ttc tte ttg ttk ttn tts ttt