-er a-a a-b a-c a-t aaa aab aac aae aaf aak aam aao aar aas aat ab- aba abb abc abe abf abk abm abo abr abs abt ac- aca acb acc ace acf ack acm aco acr acs act aea aeb aec aee aef aek aem aeo aer aes aet af- afa afb afc afe aff afk afm afo afr afs aft aka akb akc ake akk akm ako akr aks ama amb amc ame amf amk amm amo amr ams amt aoa aob aoc aoe aof aok aom aoo aor aos aot ar- ara arb arc are arf ark arm aro arr ars art as- asa asb asc ase asf ask asm aso asr ass ast at- ata atb atc ate atf atm ato atr ats att baa bab bac bae baf bak bam bao bar bas bat bba bbb bbc bbe bbf bbk bbm bbo bbr bbs bbt bca bcb bcc bce bcf bck bcm bco bcr bcs bct be- bea beb bec bee bef bek bem beo ber bes bet bfa bfb bfc bfe bff bfm bfo bfr bfs bft bka bkb bkc bke bkf bkk bkm bko bkr bks bkt bma bmb bmc bme bmf bmk bmm bmo bmr bms bmt boa bob boc boe bof bok bom boo bor bos bot bra brb bre brf brk brm bro brr brs brt bsa bsb bsc bse bsf bsk bsm bso bsr bss bst bta btb btc bte btf btk btm bto btr bts btt c-- caa cab cac cae caf cak cam cao car cas cat cba cbb cbc cbe cbf cbk cbm cbo cbr cbs cbt cca ccb ccc cce ccf cck ccm cco ccr ccs cct ce- cea ceb cec cee cef cek cem ceo cer ces cet cfa cfb cfc cfe cff cfk cfm cfo cfr cfs cft cka ckb ckc ckm cko cks ckt cma cmb cmc cme cmf cmk cmm cmo cmr cms cmt co- coa cob coc coe cof cok com coo cor cos cot cra crb crc cre crf crk crm cro crr crs crt csa csb csc cse csf csk csm cso csr css cst cta ctb ctc cte ctf ctk ctm cto ctr cts ctt eaa eab eac eae eaf eak eam eao ear eas eat eba ebb ebc ebe ebf ebk ebm ebo ebr ebs ebt ec- eca ecb ecc ece ecf eck ecm eco ecr ecs ect eea eeb eec eee eef eek eem eeo eer ees eet ef- efa efb efc efe eff efm efo efr efs eft eka ekb ekc eke ekf eko ekr eks ekt em- ema emb emc eme emf emk emm emo emr ems emt eo- eoa eob eoc eoe eof eok eom eoo eor eos eot era erb erc ere erf erk erm ero err ers ert es- esa esb esc ese esf esk esm eso esr ess est eta etb etc ete etf etk etm eto etr ets ett faa fab fac fae faf fak fam fao far fas fat fba fbb fbc fbe fbf fbk fbm fbo fbr fbs fbt fca fcb fcc fce fcf fck fcm fco fcr fcs fct fea feb fec fee fef fek fem feo fer fes fet ffa ffc ffe fff ffk ffm ffo ffr ffs fft fka fkb fkc fkf fkk fkm fkt fma fmb fmc fme fmf fmm fmo fmr fms fmt foa fob foc foe fof fok fom foo for fos fot fra frb frc fre frf frk frm fro frr frs frt fsa fsb fsc fse fsf fsk fsm fso fsr fss fst fta ftb ftc fte ftf ftk ftm fto ftr fts ftt k-t ka- kaa kab kac kae kaf kak kam kao kar kas kat kba kbb kbc kbe kbf kbk kbm kbo kbr kbs kca kcb kcc kce kck kcm kcr kcs kct ke- kea keb kec kee kef kek kem keo ker kes ket kfa kfc kff kfm kfo kfs kkb kkc kke kkk kkm kkr kks kkt kma kmb kmc kme kmf kmk kmm kmo kms kmt koa kob koc koe kof kok kom koo kor kos kot kra krc krf krk kro krr krs krt ksa ksb ksc kse ksf ksk ksm kso ksr kss kst kta ktb ktc kte ktf ktk ktm kto ktr kts ktt m-f m-o m-r maa mab mac mae maf mak mam mao mar mas mat mba mbb mbc mbe mbf mbk mbm mbo mbr mbs mbt mc- mca mcb mcc mce mcf mck mcm mco mcr mcs mct mea meb mec mee mef mek mem meo mer mes met mfa mfb mfc mfe mff mfm mfo mfr mfs mft mka mkb mkc mke mkk mkm mko mkr mks mkt mma mmb mmc mme mmf mmk mmm mmo mmr mms mmt moa mob moc moe mof mok mom moo mor mos mot mra mrb mrc mre mrf mrk mrm mro mrr mrs mrt msa msb msc mse msf msk msm mso msr mss mst mta mtb mtc mte mtf mtk mtm mto mtr mts mtt oaa oab oac oae oaf oak oam oao oar oas oat ob- oba obb obc obe obf obk obm obo obr obs obt oc- oca ocb occ ocf ock ocm oco ocr ocs oct oea oeb oec oee oef oem oeo oer oes oet of- ofa ofb ofc ofe off ofm ofo ofr ofs oft oka okb okc oke okk oko okr oks om- oma omb omc ome omf omm omo omr oms omt oo- ooa oob ooc oof ook oom ooo oor oos oot or- ora orb orc ore orf ork orm oro orr ors ort os- osa osb osc ose osf osk osm oso osr oss ost ot- ota otb otc ote otf otk otm oto otr ots ott ra- raa rab rac rae raf rak ram rao rar ras rat rba rbb rbc rbe rbf rbk rbm rbo rbr rbs rbt rca rcb rcc rce rcf rcm rco rcr rcs rct re- rea reb rec ree ref rek