a-a a-b a-i a-z aaa aab aag aai aak aao aar aaz ab- aba abb abg abi abk abo abr abz ag- aga agb agg agi agk ago agr agz ai- aia aib aig aii aik aio air aiz aka akb akg aki akk ako akr aoa aob aog aoi aok aoo aor ar- ara arb arg ari ark aro arr arz az- aza azb azg azi azo azz baa bab bag bai bak bao bar baz bba bbb bbg bbi bbk bbo bbr bga bgb bgg bgi bgk bgo bgr bgz bi- bia bib big bii bik bio bir biz bka bkb bkg bkk bko bkr boa bob bog boi bok boo bor boz bra brb brg bri brk bro brr brz bza bzo bzr bzz gaa gab gag gai gak gao gar gaz gba gbg gbi gbk gbo gbr gbz gga ggb ggg ggi ggo ggr ggz gia gib gig gii gik gio gir giz gka gkb gko goa gob gog goi gok goo gor goz gra grb grg gri grk gro grr gza gzo gzr ia- iaa iab iag iai iao iar iaz iba ibb ibg ibi ibk ibo ibr ibz iga igb igg igi igk igo igr iia iib iii iio iir ika ikb iki ikk iko ikr io- ioa iob iog ioi ioo ior ir- ira irb irg iri irk iro irr iza izi izo izz k-z ka- kaa kab kag kai kak kao kar kaz kba kbb kbi kbk kbo kbr kbz kga kgb kgi kgo kia kib kig kii kik kio kir kiz kkb kki kkk kkr koa kob kog koi kok koo kor koz kra krg kri krk kro krr kzo o-i oaa oab oag oai oak oao oar ob- oba obb obg obi obk obo obr oga ogg ogi ogo oia oib oii oik oio oir oiz oka okb okg oki okk oko okr oo- ooa oob oog ooi ook ooo oor or- ora orb org ori ork oro orr orz oza ozo ozz ra- raa rab rag rai rak rao rar raz rba rbb rbg rbi rbk rbo rbr rga rgb rgg rgi rgk rgo rgr ria rib rig rii rik rio rir riz rkb rkg rkk rko rkz roa rob rog roi rok roo ror roz rra rrb rrg rri rrk rrr rza rzb rzo z-g zaa zab zag zai zak zao zar zaz zbb zbr zgb zgg zgi zia zib zig zik zio zir ziz zka zo- zoa zob zog zoi zok zoo zor zro zzr zzz