a-a a-b a-c a-t a-z aaa aab aac aan aao aar aat aau aaz ab- aba abb abc abn abo abr abt abu abz ac- aca acb acc acn aco acr act acu acz an- ana anb anc ann ano anr ant anu anz aoa aob aoc aon aoo aor aot aou ar- ara arb arc arn aro arr art aru arz at- ata atb atc atn ato atr att atu atz au- aua aub auc aun auo aur aut auz az- aza azb azn azo azt azu azz b-u baa bab bac ban bao bar bat bau baz bba bbb bbc bbn bbo bbr bbt bbu bca bcb bcc bcn bco bcr bct bcu bcz bna bnb bnc bnn bno bnr bnt bnu bnz boa bob boc bon boo bor bot bou boz bra brb brn bro brr brt bru brz bta btb btc btn bto btr btt btu btz bua bub buc bun buo bur but buu buz bza bzn bzo bzr bzu bzz c-- caa cab cac can cao car cat cau caz cba cbb cbc cbn cbo cbr cbt cbu cbz cca ccb ccc ccn cco ccr cct ccu ccz cn- cna cnb cnc cnn cno cnr cnt cnu co- coa cob coc con coo cor cot cou coz cra crb crc crn cro crr crt cru crz cta ctb ctc ctn cto ctr ctt ctu ctz cua cub cuc cun cuo cur cut cuu cuz cz- czc czo czt naa nab nac nan nao nar nat nau naz nba nbb nbc nbn nbo nbr nbt nbu nca ncb ncc ncn nco ncr nct ncu nna nnb nnc nnn nno nnt nnu nnz no- noa nob noc non noo nor not nou noz nra nrb nrc nrn nro nrr nrt nru nrz nta ntb ntc ntn nto ntr ntt ntu ntz nua nub nuc nun nuo nur nut nuu nzb nzo nzz oaa oab oac oan oao oar oat oau ob- oba obb obc obn obo obr obt obu oc- oca ocb occ ocn oco ocr oct ocu ocz on- ona onb onc onn ono onr ont onu oo- ooa oob ooc oon ooo oor oot or- ora orb orc orn oro orr ort oru orz ot- ota otb otc otn oto otr ott otu otz ou- oua ouc oun ouo our out oza ozo ozt ozu ozz ra- raa rab rac ran rao rar rat rau raz rba rbb rbc rbn rbo rbr rbt rbu rca rcb rcc rcn rco rcr rct rcu rna rnb rnc rnn rno rnr rnt rnu rnz roa rob roc ron roo ror rot rou roz rra rrb rrc rrn rrr rrt rru rta rtb rtc rtn rto rtr rtt rtu rtz rua rub ruc run ruo rur rut ruu ruz rza rzb rzo taa tab tac tan tao tar tat tau taz tba tbb tbc tbn tbo tbr tbt tbu tbz tca tcb tcc tcn tco tcr tct tcu tna tnb tnc tnn tno tnr tnt tnz to- toa tob toc ton too tor tot tou toz tra trb trc trn tro trr trt tru trz tta ttb ttc ttn tto ttr ttt ttu tua tub tuc tun tuo tur tut tuu tuz tza tzu ua- uaa uab uac uan uao uar uat uau uaz uba ubb ubc ubn ubo ubr ubt ubu uca ucb ucc ucn uco ucr uct ucu un- una unb unc unn uno unr unt unu uoa uob uoc uon uoo uor uot ur- ura urb urc urn uro urr urt uru urz uta utb utc utn uto utr utt utu utz uua uuc uun uur uut uuu uza uzb uzo uzu zaa zab zac zan zao zar zat zaz zbb zbc zbr zbt zco znc znn zno zo- zoa zob zoc zon zoo zor zot zou zro zta ztr zub zuc zun zur zut zuz zzr zzt zzz