a-a a-b a-c a-t aaa aab aac aan aao aar aat aay ab- aba abb abc abn abo abr abt aby ac- aca acb acc acn aco acr act acy an- ana anb anc ann ano anr ant any aoa aob aoc aon aoo aor aot ar- ara arb arc arn aro arr art ary at- ata atb atc atn ato atr att ay- aya ayc ayn ayo ayr ayt baa bab bac ban bao bar bat bay bba bbb bbc bbn bbo bbr bbt bby bca bcb bcc bcn bco bcr bct bcy bna bnb bnc bnn bno bnr bnt boa bob boc bon boo bor bot boy bra brb brn bro brr brt bry bta btb btc btn bto btr btt bty by- bya byc byn byo byr byt c-- caa cab cac can cao car cat cay cba cbb cbc cbn cbo cbr cbt cby cca ccb ccc ccn cco ccr cct cn- cna cnb cnc cnn cno cnr cnt cny co- coa cob coc con coo cor cot coy cra crb crc crn cro crr crt cry cta ctb ctc ctn cto ctr ctt cty cya cyb cyc cyn cyo cyr cyt naa nab nac nan nao nar nat nay nba nbb nbc nbn nbo nbr nbt nca ncb ncc ncn nco ncr nct nna nnb nnc nnn nno nnt no- noa nob noc non noo nor not noy nra nrb nrc nrn nro nrr nrt nry nta ntb ntc ntn nto ntr ntt nya nyc nyn nyo nyt nyy oaa oab oac oan oao oar oat ob- oba obb obc obn obo obr obt oby oc- oca ocb occ ocn oco ocr oct on- ona onb onc onn ono onr ont ony oo- ooa oob ooc oon ooo oor oot or- ora orb orc orn oro orr ort ory ot- ota otb otc otn oto otr ott oya oyo ra- raa rab rac ran rao rar rat ray rba rbb rbc rbn rbo rbr rbt rca rcb rcc rcn rco rcr rct rna rnb rnc rnn rno rnr rnt rny roa rob roc ron roo ror rot roy rra rrb rrc rrn rrr rrt rta rtb rtc rtn rto rtr rtt rty ry- rya ryc ryn ryo ryr ryy taa tab tac tan tao tar tat tay tba tbb tbc tbn tbo tbr tbt tca tcb tcc tcn tco tcr tct tna tnb tnc tnn tno tnr tnt to- toa tob toc ton too tor tot toy tra trb trc trn tro trr trt try tta ttb ttc ttn tto ttr ttt tty tya tyc tyn tyo tyr tyt yaa yab yac yan yao yar yat yay ybc ybr yby yca ycc yco ycy yna ynn yny yob yoc yon yoo yor yot yoy yra yrc yrn yro yrt yta ytc ytn yto ytr ytt yyb yyc yyt yyy