a-a a-b a-i a-t a-z aaa aab aai aan aao aar aat aaz ab- aba abb abi abn abo abr abt abz ai- aia aib aii ain aio air ait aiz an- ana anb ani ann ano anr ant anz aoa aob aoi aon aoo aor aot ar- ara arb ari arn aro arr art arz at- ata atb ati atn ato atr att atz az- aza azb azi azn azo azt azz baa bab bai ban bao bar bat baz bba bbb bbi bbn bbo bbr bbt bi- bia bib bii bin bio bir bit biz bna bnb bni bnn bno bnr bnt bnz boa bob boi bon boo bor bot boz bra brb bri brn bro brr brt brz bta btb bti btn bto btr btt btz bza bzn bzo bzr bzz ia- iaa iab iai ian iao iar iat iaz iba ibb ibi ibn ibo ibr ibt ibz iia iib iii iin iio iir iit in- ina inb ini inn ino inr int io- ioa iob ioi ion ioo ior iot ir- ira irb iri irn iro irr irt ita itb iti itn ito itt itz iza izi izo izz n-i naa nab nai nan nao nar nat naz nba nbb nbi nbn nbo nbr nbt nia nib nii nin nio nir nit niz nna nnb nni nnn nno nnt nnz no- noa nob noi non noo nor not noz nra nrb nri nrn nro nrr nrt nrz nta ntb nti ntn nto ntr ntt ntz nzb nzi nzo nzz o-i oaa oab oai oan oao oar oat ob- oba obb obi obn obo obr obt oia oib oii oin oio oir oit oiz on- ona onb oni onn ono onr ont oo- ooa oob ooi oon ooo oor oot or- ora orb ori orn oro orr ort orz ot- ota otb oti otn oto otr ott otz oza ozo ozt ozz ra- raa rab rai ran rao rar rat raz rba rbb rbi rbn rbo rbr rbt ria rib rii rin rio rir rit riz rna rnb rni rnn rno rnr rnt rnz roa rob roi ron roo ror rot roz rra rrb rri rrn rrr rrt rta rtb rti rtn rto rtr rtt rtz rza rzb rzo taa tab tai tan tao tar tat taz tba tbb tbi tbn tbo tbr tbt tbz tia tib tii tin tio tir tit tiz tna tnb tni tnn tno tnr tnt tnz to- toa tob toi ton too tor tot toz tra trb tri trn tro trr trt trz tta ttb tti ttn tto ttr ttt tza zaa zab zai zan zao zar zat zaz zbb zbr zbt zia zib zin zio zir zit ziz znn zno zo- zoa zob zoi zon zoo zor zot zro zta ztr zzr zzt zzz