-er a-a a-b a-i a-t aaa aab aae aaf aag aai aak aao aar aas aat ab- aba abb abe abf abg abi abk abo abr abs abt aea aeb aee aef aeg aei aek aeo aer aes aet af- afa afb afe aff afg afi afk afo afr afs aft ag- aga agb age agf agg agi agk ago agr ags agt ai- aia aib aie aif aig aii aik aio air ais ait aka akb ake akg aki akk ako akr aks aoa aob aoe aof aog aoi aok aoo aor aos aot ar- ara arb are arf arg ari ark aro arr ars art as- asa asb ase asf asg asi ask aso asr ass ast at- ata atb ate atf atg ati ato atr ats att baa bab bae baf bag bai bak bao bar bas bat bba bbb bbe bbf bbg bbi bbk bbo bbr bbs bbt be- bea beb bee bef beg bei bek beo ber bes bet bfa bfb bfe bff bfg bfi bfo bfr bfs bft bga bgb bge bgf bgg bgi bgk bgo bgr bgs bgt bi- bia bib bie bif big bii bik bio bir bis bit bka bkb bke bkf bkg bkk bko bkr bks bkt boa bob boe bof bog boi bok boo bor bos bot bra brb bre brf brg bri brk bro brr brs brt bsa bsb bse bsf bsg bsi bsk bso bsr bss bst bta btb bte btf btg bti btk bto btr bts btt eaa eab eae eaf eag eai eak eao ear eas eat eba ebb ebe ebf ebg ebi ebk ebo ebr ebs ebt eea eeb eee eef eeg eek eeo eer ees eet ef- efa efb efe eff efg efi efo efr efs eft ega egb ege egf egg egi ego egr egs egt eia eib eie eif eig eii eik eio eir eis eit eka ekb eke ekf ekg eki eko ekr eks ekt eo- eoa eob eoe eof eog eoi eok eoo eor eos eot era erb ere erf erg eri erk ero err ers ert es- esa esb ese esf esg esi esk eso esr ess est eta etb ete etf etg eti etk eto etr ets ett faa fab fae faf fag fai fak fao far fas fat fba fbb fbe fbf fbg fbi fbk fbo fbr fbs fbt fea feb fee fef feg fei fek feo fer fes fet ffa ffe fff ffg ffi ffk ffo ffr ffs fft fga fgb fge fgf fgg fgi fgr fgs fgt fia fib fie fif fig fii fik fir fis fit fka fkb fkf fkg fki fkk fkt foa fob foe fof fog foi fok foo for fos fot fra frb fre frf frg fri frk fro frr frs frt fsa fsb fse fsf fsg fsi fsk fso fsr fss fst fta ftb fte ftf ftg fti ftk fto ftr fts ftt gaa gab gae gaf gag gai gak gao gar gas gat gba gbe gbf gbg gbi gbk gbo gbr gbs gbt ge- gea geb gee gef geg gei gek geo ger ges get gfa gfb gfe gff gfi gfk gfo gfr gfs gft gga ggb ggg ggi ggo ggr ggs ggt gia gib gie gif gig gii gik gio gir gis git gka gkb gko gks gkt goa gob goe gof gog goi gok goo gor gos got gra grb gre grf grg gri grk gro grr grs grt gsa gsb gse gsf gsg gsi gsk gso gsr gss gst gta gtb gte gtf gtg gti gtk gto gtr gts gtt i-f ia- iaa iab iae iaf iag iai iao iar ias iat iba ibb ibe ibf ibg ibi ibk ibo ibr ibs ibt ie- iea iee ief ieg iei iek ier ies iet ifa ifb ife iff ifg ifi ifo ifr ifs ift iga igb ige igf igg igi igk igo igr igs igt iia iib iie iif iii iio iir iis iit ika ikb ike ikf iki ikk iko ikr iks ikt io- ioa iob ioe iof iog ioi ioo ior ios iot ir- ira irb ire irf irg iri irk iro irr irs irt is- isa isb ise isf isg isi isk iso isr iss ist ita itb ite itf itg iti itk ito its itt k-t ka- kaa kab kae kaf kag kai kak kao kar kas kat kba kbb kbe kbf kbi kbk kbo kbr kbs ke- kea keb kee kef keg kei kek keo ker kes ket kfa kff kfg kfi kfo kfs kga kgb kgf kgi kgo kgs kia kib kie kif kig kii kik kio kir kis kit kkb kke kki kkk kkr kks kkt koa kob koe kof kog koi kok koo kor kos kot kra krf krg kri krk kro krr krs krt ksa ksb kse ksf ksg ksi ksk kso ksr kss kst kta ktb kte ktf ktg ktk kto ktr kts ktt o-i oaa oab oae oaf oag oai oak oao oar oas oat ob- oba obb obe obf obg obi obk obo obr obs obt oea oeb oee oef oeg oei oeo oer oes oet of- ofa ofb ofe off ofg ofi ofo ofr ofs oft oga oge ogf ogg ogi ogo ogs ogt oia oib oie oif oii oik oio oir ois oit oka okb oke okg oki okk oko okr oks oo- ooa oob oof oog ooi ook ooo oor oos oot or- ora orb ore orf org ori ork oro orr ors ort os- osa osb ose osf osg osi osk oso osr oss ost ot- ota otb ote otf otg oti otk oto otr ots ott ra- raa rab rae raf rag rai rak rao rar ras rat rba rbb rbe rbf rbg rbi rbk rbo rbr rbs rbt re- rea reb ree ref reg rei rek reo rer res ret rfa rfb rfe rff rfg rfi rfk rfo rfr rfs rft rga rgb rge rgf rgg rgi rgk rgo rgr rgs rgt ria rib rie rif rig rii