a-a a-b a-i a-z aaa aab aag aai aao aas aaz ab- aba abb abg abi abo abs abz ag- aga agb agg agi ago ags agz ai- aia aib aig aii aio ais aiz aoa aob aog aoi aoo aos as- asa asb asg asi aso ass asz az- aza azb azg azi azo azs azz baa bab bag bai bao bas baz bba bbb bbg bbi bbo bbs bga bgb bgg bgi bgo bgs bgz bi- bia bib big bii bio bis biz boa bob bog boi boo bos boz bsa bsb bsg bsi bso bss bza bzo bzs bzz gaa gab gag gai gao gas gaz gba gbg gbi gbo gbs gbz gga ggb ggg ggi ggo ggs ggz gia gib gig gii gio gis giz goa gob gog goi goo gos goz gsa gsb gsg gsi gso gss gza gzo ia- iaa iab iag iai iao ias iaz iba ibb ibg ibi ibo ibs ibz iga igb igg igi igo igs iia iib iii iio iis io- ioa iob iog ioi ioo ios is- isa isb isg isi iso iss iza izi izo izz o-i oaa oab oag oai oao oas ob- oba obb obg obi obo obs oga ogg ogi ogo ogs oia oib oii oio ois oiz oo- ooa oob oog ooi ooo oos os- osa osb osg osi oso oss oza ozo ozs ozz saa sab sag sai sao sas saz sba sbb sbg sbi sbo sbs sga sgb sgg sgi sgo sgs sia sib sig sii sio sis soa sob sog soi soo sos soz ss- ssa ssb ssg ssi sso sss ssz sza szi z-g zaa zab zag zai zao zas zaz zbb zbs zgb zgg zgi zgs zia zib zig zio zis ziz zo- zoa zob zog zoi zoo zos zsa zsg zsi zsz zzs zzz