a-a a-b a-c a-t aaa aab aac aan aao aar aas aat aay ab- aba abb abc abn abo abr abs abt aby ac- aca acb acc acn aco acr acs act acy an- ana anb anc ann ano anr ans ant any aoa aob aoc aon aoo aor aos aot ar- ara arb arc arn aro arr ars art ary as- asa asb asc asn aso asr ass ast asy at- ata atb atc atn ato atr ats att ay- aya ayc ayn ayo ayr ays ayt baa bab bac ban bao bar bas bat bay bba bbb bbc bbn bbo bbr bbs bbt bby bca bcb bcc bcn bco bcr bcs bct bcy bna bnb bnc bnn bno bnr bns bnt boa bob boc bon boo bor bos bot boy bra brb brn bro brr brs brt bry bsa bsb bsc bsn bso bsr bss bst bsy bta btb btc btn bto btr bts btt bty by- bya byc byn byo byr bys byt c-- caa cab cac can cao car cas cat cay cba cbb cbc cbn cbo cbr cbs cbt cby cca ccb ccc ccn cco ccr ccs cct cn- cna cnb cnc cnn cno cnr cns cnt cny co- coa cob coc con coo cor cos cot coy cra crb crc crn cro crr crs crt cry csa csb csc csn cso csr css cst csy cta ctb ctc ctn cto ctr cts ctt cty cya cyb cyc cyn cyo cyr cys cyt naa nab nac nan nao nar nas nat nay nba nbb nbc nbn nbo nbr nbs nbt nca ncb ncc ncn nco ncr ncs nct nna nnb nnc nnn nno nns nnt no- noa nob noc non noo nor nos not noy nra nrb nrc nrn nro nrr nrs nrt nry nsa nsb nsc nsn nso nsr nss nst nsy nta ntb ntc ntn nto ntr nts ntt nya nyc nyn nyo nys nyt nyy oaa oab oac oan oao oar oas oat ob- oba obb obc obn obo obr obs obt oby oc- oca ocb occ ocn oco ocr ocs oct on- ona onb onc onn ono onr ons ont ony oo- ooa oob ooc oon ooo oor oos oot or- ora orb orc orn oro orr ors ort ory os- osa osb osc osn oso osr oss ost ot- ota otb otc otn oto otr ots ott oya oyo oys ra- raa rab rac ran rao rar ras rat ray rba rbb rbc rbn rbo rbr rbs rbt rca rcb rcc rcn rco rcr rcs rct rna rnb rnc rnn rno rnr rns rnt rny roa rob roc ron roo ror ros rot roy rra rrb rrc rrn rrr rrs rrt rsa rsb rsc rsn rso rsr rss rst rta rtb rtc rtn rto rtr rts rtt rty ry- rya ryc ryn ryo ryr rys ryy saa sab sac san sao sar sas sat say sba sbb sbc sbn sbo sbr sbs sbt sby sca scb scc scn sco scr scs sct sna snb snc snn sno snr sns snt sny soa sob soc son soo sor sos sot soy sr- sra srb src srn sro srr srs srt sry ss- ssa ssb ssc ssn sso ssr sss sst sta stb stc stn sto str sts stt sty sy- sya syb syc syn syr sys syt taa tab tac tan tao tar tas tat tay tba tbb tbc tbn tbo tbr tbs tbt tca tcb tcc tcn tco tcr tcs tct tna tnb tnc tnn tno tnr tns tnt to- toa tob toc ton too tor tos tot toy tra trb trc trn tro trr trs trt try tsa tsb tsc tsn tso tsr tss tst tsy tta ttb ttc ttn tto ttr tts ttt tty tya tyc tyn tyo tyr tys tyt yaa yab yac yan yao yar yas yat yay ybc ybr ybs yby yca ycc yco ycs ycy yna ynn yns yny yob yoc yon yoo yor yos yot yoy yra yrc yrn yro yrs yrt ysa ysb ysc yso ysr yss yst ysy yta ytc ytn yto ytr yts ytt yyb yyc yys yyt yyy