a-a a-b a-c a-t aaa aab aac aak aao aar aas aat aay ab- aba abb abc abk abo abr abs abt aby ac- aca acb acc ack aco acr acs act acy aka akb akc akk ako akr aks aoa aob aoc aok aoo aor aos aot ar- ara arb arc ark aro arr ars art ary as- asa asb asc ask aso asr ass ast asy at- ata atb atc ato atr ats att ay- aya ayc ayk ayo ayr ays ayt baa bab bac bak bao bar bas bat bay bba bbb bbc bbk bbo bbr bbs bbt bby bca bcb bcc bck bco bcr bcs bct bcy bka bkb bkc bkk bko bkr bks bkt boa bob boc bok boo bor bos bot boy bra brb brk bro brr brs brt bry bsa bsb bsc bsk bso bsr bss bst bsy bta btb btc btk bto btr bts btt bty by- bya byc byk byo byr bys byt c-- caa cab cac cak cao car cas cat cay cba cbb cbc cbk cbo cbr cbs cbt cby cca ccb ccc cck cco ccr ccs cct cka ckb ckc cko cks ckt cky co- coa cob coc cok coo cor cos cot coy cra crb crc crk cro crr crs crt cry csa csb csc csk cso csr css cst csy cta ctb ctc ctk cto ctr cts ctt cty cya cyb cyc cyk cyo cyr cys cyt k-t ka- kaa kab kac kak kao kar kas kat kay kba kbb kbc kbk kbo kbr kbs kca kcb kcc kck kcr kcs kct kkb kkc kkk kkr kks kkt kky koa kob koc kok koo kor kos kot koy kra krc krk kro krr krs krt kry ksa ksb ksc ksk kso ksr kss kst kta ktb ktc ktk kto ktr kts ktt kya kyc kyo kyr kys kyt oaa oab oac oak oao oar oas oat ob- oba obb obc obk obo obr obs obt oby oc- oca ocb occ ock oco ocr ocs oct oka okb okc okk oko okr oks oo- ooa oob ooc ook ooo oor oos oot or- ora orb orc ork oro orr ors ort ory os- osa osb osc osk oso osr oss ost ot- ota otb otc otk oto otr ots ott oya oyo oys ra- raa rab rac rak rao rar ras rat ray rba rbb rbc rbk rbo rbr rbs rbt rca rcb rcc rco rcr rcs rct rkb rkc rkk rko rks rkt rky roa rob roc rok roo ror ros rot roy rra rrb rrc rrk rrr rrs rrt rsa rsb rsc rsk rso rsr rss rst rta rtb rtc rtk rto rtr rts rtt rty ry- rya ryc ryk ryo ryr rys ryy saa sab sac sak sao sar sas sat say sba sbb sbc sbk sbo sbr sbs sbt sby sca scb scc sck sco scr scs sct sk- ska skb skc skk sko skr sks skt sky soa sob soc sok soo sor sos sot soy sr- sra srb src srk sro srr srs srt sry ss- ssa ssb ssc ssk sso ssr sss sst sta stb stc stk sto str sts stt sty sy- sya syb syc syk syr sys syt taa tab tac tak tao tar tas tat tay tba tbb tbc tbk tbo tbr tbs tbt tca tcb tcc tck tco tcr tcs tct tka tkb tkc tkk tko tkr tks tkt tky to- toa tob toc tok too tor tos tot toy tra trb trc trk tro trr trs trt try tsa tsb tsc tsk tso tsr tss tst tsy tta ttb ttc ttk tto ttr tts ttt tty tya tyc tyo tyr tys tyt yaa yab yac yak yao yar yas yat yay ybc ybr ybs yby yca ycc yco ycs ycy yka ykk yob yoc yok yoo yor yos yot yoy yra yrc yro yrs yrt ysa ysb ysc ysk yso ysr yss yst ysy yta ytc ytk yto ytr yts ytt yyb yyc yys yyt yyy