a-a a-b a-c a-t aaa aab aac aag aak aan aao aar aas aat ab- aba abb abc abg abk abn abo abr abs abt ac- aca acb acc acg ack acn aco acr acs act ag- aga agb agc agg agk agn ago agr ags agt aka akb akc akg akk akn ako akr aks an- ana anb anc ang ank ann ano anr ans ant aoa aob aoc aog aok aon aoo aor aos aot ar- ara arb arc arg ark arn aro arr ars art as- asa asb asc asg ask asn aso asr ass ast at- ata atb atc atg atn ato atr ats att baa bab bac bag bak ban bao bar bas bat bba bbb bbc bbg bbk bbn bbo bbr bbs bbt bca bcb bcc bcg bck bcn bco bcr bcs bct bga bgb bgc bgg bgk bgn bgo bgr bgs bgt bka bkb bkc bkg bkk bkn bko bkr bks bkt bna bnb bnc bng bnk bnn bno bnr bns bnt boa bob boc bog bok bon boo bor bos bot bra brb brg brk brn bro brr brs brt bsa bsb bsc bsg bsk bsn bso bsr bss bst bta btb btc btg btk btn bto btr bts btt c-- caa cab cac cag cak can cao car cas cat cba cbb cbc cbg cbk cbn cbo cbr cbs cbt cca ccb ccc ccg cck ccn cco ccr ccs cct cga cgb cgc cgg cgn cgo cgr cgs cgt cka ckb ckc cko cks ckt cn- cna cnb cnc cng cnn cno cnr cns cnt co- coa cob coc cog cok con coo cor cos cot cra crb crc crg crk crn cro crr crs crt csa csb csc csg csk csn cso csr css cst cta ctb ctc ctg ctk ctn cto ctr cts ctt gaa gab gac gag gak gan gao gar gas gat gba gbc gbg gbk gbn gbo gbr gbs gbt gca gcb gcc gcg gck gcn gco gcr gcs gct gga ggb ggc ggg ggn ggo ggr ggs ggt gka gkb gkn gko gks gkt gna gnb gnc gnn gno gnr gns gnt goa gob goc gog gok gon goo gor gos got gra grb grc grg grk grn gro grr grs grt gsa gsb gsc gsg gsk gsn gso gsr gss gst gta gtb gtc gtg gtk gtn gto gtr gts gtt k-t ka- kaa kab kac kag kak kan kao kar kas kat kba kbb kbc kbk kbn kbo kbr kbs kca kcb kcc kcg kck kcn kcr kcs kct kga kgb kgc kgo kgs kkb kkc kkk kkn kkr kks kkt kn- kna knc kng knk knn kno knr knt koa kob koc kog kok kon koo kor kos kot kra krc krg krk krn kro krr krs krt ksa ksb ksc ksg ksk ksn kso ksr kss kst kta ktb ktc ktg ktk ktn kto ktr kts ktt naa nab nac nag nak nan nao nar nas nat nba nbb nbc nbg nbk nbn nbo nbr nbs nbt nca ncb ncc ncg nck ncn nco ncr ncs nct nga ngb ngc ngg ngk ngn ngo ngs ngt nka nkc nkk nkn nko nkr nks nkt nna nnb nnc nng nnk nnn nno nns nnt no- noa nob noc nog nok non noo nor nos not nra nrb nrc nrg nrk nrn nro nrr nrs nrt nsa nsb nsc nsg nsk nsn nso nsr nss nst nta ntb ntc ntg ntk ntn nto ntr nts ntt oaa oab oac oag oak oan oao oar oas oat ob- oba obb obc obg obk obn obo obr obs obt oc- oca ocb occ ocg ock ocn oco ocr ocs oct oga ogc ogg ogn ogo ogs ogt oka okb okc okg okk oko okr oks on- ona onb onc ong onk onn ono onr ons ont oo- ooa oob ooc oog ook oon ooo oor oos oot or- ora orb orc org ork orn oro orr ors ort os- osa osb osc osg osk osn oso osr oss ost ot- ota otb otc otg otk otn oto otr ots ott ra- raa rab rac rag rak ran rao rar ras rat rba rbb rbc rbg rbk rbn rbo rbr rbs rbt rca rcb rcc rcg rcn rco rcr rcs rct rga rgb rgc rgg rgk rgn rgo rgr rgs rgt rkb rkc rkg rkk rko rks rkt rna rnb rnc rng rnn rno rnr rns rnt roa rob roc rog rok ron roo ror ros rot rra rrb rrc rrg rrk rrn rrr rrs rrt rsa rsb rsc rsg rsk rsn rso rsr rss rst rta rtb rtc rtg rtk rtn rto rtr rts rtt saa sab sac sag sak san sao sar sas sat sba sbb sbc sbg sbk sbn sbo sbr sbs sbt sca scb scc scg sck scn sco scr scs sct sga sgb sgc sgg sgk sgn sgo sgr sgs sgt sk- ska skb skc skg skk sko skr sks skt sna snb snc sng snk snn sno snr sns snt soa sob soc sog sok son soo sor sos sot sr- sra srb src srg srk srn sro srr srs srt ss- ssa ssb ssc ssg ssk ssn sso ssr sss sst sta stb stc stg stk stn sto str sts stt taa tab tac tag tak tan tao tar tas tat tba tbb tbc tbg tbk tbn tbo tbr tbs tbt tca tcb tcc tcg tck tcn tco tcr tcs tct tga tgb tgc tgg tgk tgn tgo tgr tgs tgt tka tkb tkc tkg tkk tko tkr tks tkt tna tnb tnc tng tnk tnn tno tnr tns tnt to- toa tob toc tog tok ton too tor tos tot tra trb trc trg trk trn tro trr trs trt tsa tsb tsc tsg tsk tsn tso tsr tss tst tta ttb ttc ttg ttk ttn tto ttr tts ttt