-er a-a a-b a-t aaa aab aae aaf aak aam aao aar aas aat ab- aba abb abe abf abk abm abo abr abs abt aea aeb aee aef aek aem aeo aer aes aet af- afa afb afe aff afk afm afo afr afs aft aka akb ake akk akm ako akr aks ama amb ame amf amk amm amo amr ams amt aoa aob aoe aof aok aom aoo aor aos aot ar- ara arb are arf ark arm aro arr ars art as- asa asb ase asf ask asm aso asr ass ast at- ata atb ate atf atm ato atr ats att baa bab bae baf bak bam bao bar bas bat bba bbb bbe bbf bbk bbm bbo bbr bbs bbt be- bea beb bee bef bek bem beo ber bes bet bfa bfb bfe bff bfm bfo bfr bfs bft bka bkb bke bkf bkk bkm bko bkr bks bkt bma bmb bme bmf bmk bmm bmo bmr bms bmt boa bob boe bof bok bom boo bor bos bot bra brb bre brf brk brm bro brr brs brt bsa bsb bse bsf bsk bsm bso bsr bss bst bta btb bte btf btk btm bto btr bts btt eaa eab eae eaf eak eam eao ear eas eat eba ebb ebe ebf ebk ebm ebo ebr ebs ebt eea eeb eee eef eek eem eeo eer ees eet ef- efa efb efe eff efm efo efr efs eft eka ekb eke ekf eko ekr eks ekt em- ema emb eme emf emk emm emo emr ems emt eo- eoa eob eoe eof eok eom eoo eor eos eot era erb ere erf erk erm ero err ers ert es- esa esb ese esf esk esm eso esr ess est eta etb ete etf etk etm eto etr ets ett faa fab fae faf fak fam fao far fas fat fba fbb fbe fbf fbk fbm fbo fbr fbs fbt fea feb fee fef fek fem feo fer fes fet ffa ffe fff ffk ffm ffo ffr ffs fft fka fkb fkf fkk fkm fkt fma fmb fme fmf fmm fmo fmr fms fmt foa fob foe fof fok fom foo for fos fot fra frb fre frf frk frm fro frr frs frt fsa fsb fse fsf fsk fsm fso fsr fss fst fta ftb fte ftf ftk ftm fto ftr fts ftt k-t ka- kaa kab kae kaf kak kam kao kar kas kat kba kbb kbe kbf kbk kbm kbo kbr kbs ke- kea keb kee kef kek kem keo ker kes ket kfa kff kfm kfo kfs kkb kke kkk kkm kkr kks kkt kma kmb kme kmf kmk kmm kmo kms kmt koa kob koe kof kok kom koo kor kos kot kra krf krk kro krr krs krt ksa ksb kse ksf ksk ksm kso ksr kss kst kta ktb kte ktf ktk ktm kto ktr kts ktt m-f m-o m-r maa mab mae maf mak mam mao mar mas mat mba mbb mbe mbf mbk mbm mbo mbr mbs mbt mea meb mee mef mek mem meo mer mes met mfa mfb mfe mff mfm mfo mfr mfs mft mka mkb mke mkk mkm mko mkr mks mkt mma mmb mme mmf mmk mmm mmo mmr mms mmt moa mob moe mof mok mom moo mor mos mot mra mrb mre mrf mrk mrm mro mrr mrs mrt msa msb mse msf msk msm mso msr mss mst mta mtb mte mtf mtk mtm mto mtr mts mtt oaa oab oae oaf oak oam oao oar oas oat ob- oba obb obe obf obk obm obo obr obs obt oea oeb oee oef oem oeo oer oes oet of- ofa ofb ofe off ofm ofo ofr ofs oft oka okb oke okk oko okr oks om- oma omb ome omf omm omo omr oms omt oo- ooa oob oof ook oom ooo oor oos oot or- ora orb ore orf ork orm oro orr ors ort os- osa osb ose osf osk osm oso osr oss ost ot- ota otb ote otf otk otm oto otr ots ott ra- raa rab rae raf rak ram rao rar ras rat rba rbb rbe rbf rbk rbm rbo rbr rbs rbt re- rea reb ree ref rek rem reo rer res ret rfa rfb rfe rff rfk rfm rfo rfr rfs rft rkb rke rkf rkk rkm rko rks rkt rma rmb rme rmf rmm rmo rmr rms rmt roa rob roe rof rok rom roo ror ros rot rra rrb rrf rrk rrm rrr rrs rrt rsa rsb rse rsf rsk rsm rso rsr rss rst rta rtb rte rtf rtk rtm rto rtr rts rtt saa sab sae saf sak sam sao sar sas sat sba sbb sbe sbf sbk sbm sbo sbr sbs sbt se- sea seb see sef sek sem seo ser ses set sfa sfb sfe sff sfk sfm sfo sfr sfs sft sk- ska skb ske skf skk skm sko skr sks skt sma smb sme smf smk smm smo smr sms smt soa sob soe sof sok som soo sor sos sot sr- sra srb sre srf srk srm sro srr srs srt ss- ssa ssb sse ssf ssk ssm sso ssr sss sst sta stb ste stf stk stm sto str sts stt taa tab tae taf tak tam tao tar tas tat tba tbb tbe tbf tbk tbm tbo tbr tbs tbt te- tea teb tee tef tek tem teo ter tes tet tfa tfb tfe tff tfk tfm tfo tfr tfs tft tka tkb tke tkk tkm tko tkr tks tkt tma tmb tme tmf tmk tmm tmo tmr tms tmt to- toa tob toe tof tok tom too tor tos tot tra trb tre trf trk trm tro trr trs trt tsa tsb tse tsf tsk tsm tso tsr tss tst tta ttb tte ttf ttk ttm tto ttr tts ttt