-er a-a a-b a-z aaa aab aae aag aao aar aas aau aaz ab- aba abb abe abg abo abr abs abu abz aea aeb aee aeg aeo aer aes aeu aez ag- aga agb age agg ago agr ags agu agz aoa aob aoe aog aoo aor aos aou ar- ara arb are arg aro arr ars aru arz as- asa asb ase asg aso asr ass asu asz au- aua aub aue aug auo aur aus auz az- aza azb aze azg azo azs azu azz b-u baa bab bae bag bao bar bas bau baz bba bbb bbe bbg bbo bbr bbs bbu be- bea beb bee beg beo ber bes beu bez bga bgb bge bgg bgo bgr bgs bgu bgz boa bob boe bog boo bor bos bou boz bra brb bre brg bro brr brs bru brz bsa bsb bse bsg bso bsr bss bsu bua bub bue bug buo bur bus buu buz bza bze bzo bzr bzs bzu bzz eaa eab eae eag eao ear eas eau eaz eba ebb ebe ebg ebo ebr ebs ebu eea eeb eee eeg eeo eer ees ega egb ege egg ego egr egs egu eo- eoa eob eoe eog eoo eor eos eou era erb ere erg ero err ers eru erz es- esa esb ese esg eso esr ess esu eu- eua eub eue eug eur eus eze ezo ezr ezs ezz gaa gab gae gag gao gar gas gau gaz gba gbe gbg gbo gbr gbs gbu gbz ge- gea geb gee geg geo ger ges geu gez gga ggb ggg ggo ggr ggs ggu ggz goa gob goe gog goo gor gos gou goz gra grb gre grg gro grr grs gru gsa gsb gse gsg gso gsr gss gsu gu- gua gub gue gug guo gur gus guu guz gza gzo gzr gzu oaa oab oae oag oao oar oas oau ob- oba obb obe obg obo obr obs obu oea oeb oee oeg oeo oer oes oga oge ogg ogo ogs oo- ooa oob oog ooo oor oos or- ora orb ore org oro orr ors oru orz os- osa osb ose osg oso osr oss osu ou- oua oue ouo our ous oza oze ozo ozs ozu ozz ra- raa rab rae rag rao rar ras rau raz rba rbb rbe rbg rbo rbr rbs rbu re- rea reb ree reg reo rer res reu rez rga rgb rge rgg rgo rgr rgs roa rob roe rog roo ror ros rou roz rra rrb rrg rrr rrs rru rsa rsb rse rsg rso rsr rss rsu rua rub rue rug ruo rur rus ruu ruz rza rzb rze rzo saa sab sae sag sao sar sas sau saz sba sbb sbe sbg sbo sbr sbs sbu se- sea seb see seg seo ser ses seu sez sga sgb sge sgg sgo sgr sgs sgu soa sob soe sog soo sor sos sou soz sr- sra srb sre srg sro srr srs ss- ssa ssb sse ssg sso ssr sss ssu ssz sua sub sue sug suo sur sus suu suz sza sze szr szu ua- uaa uab uae uag uao uar uas uau uaz uba ubb ube ubg ubo ubr ubs ubu uea ueb uee ueg uer ues uga ugb uge ugg ugo ugr ugs ugu uoa uob uoe uog uoo uor uos ur- ura urb ure urg uro urr urs uru urz usa usb use usg uso usr uss usu usz uua uue uug uur uus uuu uza uzb uzo uzu z-g zaa zab zag zao zar zas zaz zbb zbr zbs zea zeb zee zeo zer zes zez zgb zgg zgs zo- zoa zob zoe zog zoo zor zos zou zro zrs zsa zse zsg zsu zsz zub zug zur zus zuz zzr zzs zzz