-er a-a a-b a-i a-t aaa aab aae aaf aag aai aao aar aas aat ab- aba abb abe abf abg abi abo abr abs abt aea aeb aee aef aeg aei aeo aer aes aet af- afa afb afe aff afg afi afo afr afs aft ag- aga agb age agf agg agi ago agr ags agt ai- aia aib aie aif aig aii aio air ais ait aoa aob aoe aof aog aoi aoo aor aos aot ar- ara arb are arf arg ari aro arr ars art as- asa asb ase asf asg asi aso asr ass ast at- ata atb ate atf atg ati ato atr ats att baa bab bae baf bag bai bao bar bas bat bba bbb bbe bbf bbg bbi bbo bbr bbs bbt be- bea beb bee bef beg bei beo ber bes bet bfa bfb bfe bff bfg bfi bfo bfr bfs bft bga bgb bge bgf bgg bgi bgo bgr bgs bgt bi- bia bib bie bif big bii bio bir bis bit boa bob boe bof bog boi boo bor bos bot bra brb bre brf brg bri bro brr brs brt bsa bsb bse bsf bsg bsi bso bsr bss bst bta btb bte btf btg bti bto btr bts btt eaa eab eae eaf eag eai eao ear eas eat eba ebb ebe ebf ebg ebi ebo ebr ebs ebt eea eeb eee eef eeg 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 eio eir eis eit eo- eoa eob eoe eof eog eoi eoo eor eos eot era erb ere erf erg eri ero err ers ert es- esa esb ese esf esg esi eso esr ess est eta etb ete etf etg eti eto etr ets ett faa fab fae faf fag fai fao far fas fat fba fbb fbe fbf fbg fbi fbo fbr fbs fbt fea feb fee fef feg fei feo fer fes fet ffa ffe fff ffg ffi ffo ffr ffs fft fga fgb fge fgf fgg fgi fgr fgs fgt fia fib fie fif fig fii fir fis fit foa fob foe fof fog foi foo for fos fot fra frb fre frf frg fri fro frr frs frt fsa fsb fse fsf fsg fsi fso fsr fss fst fta ftb fte ftf ftg fti fto ftr fts ftt gaa gab gae gaf gag gai gao gar gas gat gba gbe gbf gbg gbi gbo gbr gbs gbt ge- gea geb gee gef geg gei geo ger ges get gfa gfb gfe gff gfi gfo gfr gfs gft gga ggb ggg ggi ggo ggr ggs ggt gia gib gie gif gig gii gio gir gis git goa gob goe gof gog goi goo gor gos got gra grb gre grf grg gri gro grr grs grt gsa gsb gse gsf gsg gsi gso gsr gss gst gta gtb gte gtf gtg gti gto gtr gts gtt i-f ia- iaa iab iae iaf iag iai iao iar ias iat iba ibb ibe ibf ibg ibi ibo ibr ibs ibt ie- iea iee ief ieg iei ier ies iet ifa ifb ife iff ifg ifi ifo ifr ifs ift iga igb ige igf igg igi igo igr igs igt iia iib iie iif iii iio iir iis iit io- ioa iob ioe iof iog ioi ioo ior ios iot ir- ira irb ire irf irg iri iro irr irs irt is- isa isb ise isf isg isi iso isr iss ist ita itb ite itf itg iti ito its itt o-i oaa oab oae oaf oag oai oao oar oas oat ob- oba obb obe obf obg obi 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 oio oir ois oit oo- ooa oob oof oog ooi ooo oor oos oot or- ora orb ore orf org ori oro orr ors ort os- osa osb ose osf osg osi oso osr oss ost ot- ota otb ote otf otg oti oto otr ots ott ra- raa rab rae raf rag rai rao rar ras rat rba rbb rbe rbf rbg rbi rbo rbr rbs rbt re- rea reb ree ref reg rei reo rer res ret rfa rfb rfe rff rfg rfi rfo rfr rfs rft rga rgb rge rgf rgg rgi rgo rgr rgs rgt ria rib rie rif rig rii rio rir ris rit roa rob roe rof rog roi roo ror ros rot rra rrb rrf rrg rri rrr rrs rrt rsa rsb rse rsf rsg rsi rso rsr rss rst rta rtb rte rtf rtg rti rto rtr rts rtt saa sab sae saf sag sai sao sar sas sat sba sbb sbe sbf sbg sbi sbo sbr sbs sbt se- sea seb see sef seg sei seo ser ses set sfa sfb sfe sff sfg sfi sfo sfr sfs sft sga sgb sge sgf sgg sgi sgo sgr sgs sgt sia sib sie sif sig sii sio sir sis sit soa sob soe sof sog soi soo sor sos sot sr- sra srb sre srf srg sri sro srr srs srt ss- ssa ssb sse ssf ssg ssi sso ssr sss sst sta stb ste stf stg sti sto str sts stt taa tab tae taf tag tai tao tar tas tat tba tbb tbe tbf tbg tbi tbo tbr tbs tbt te- tea teb tee tef teg tei teo ter tes tet tfa tfb tfe tff tfg tfi tfo tfr tfs tft tga tgb tge tgf tgg tgi tgo tgr tgs tgt tia tib tie tif tig tii tio tir tis tit to- toa tob toe tof tog toi too tor tos tot tra trb tre trf trg tri tro trr trs trt