-er a-a a-c aaa aac aae aaf aak aam aao aar ac- aca acc ace acf ack acm aco acr aea aec aee aef aek aem aeo aer af- afa afc afe aff afk afm afo afr aka akc ake akk akm ako akr ama amc ame amf amk amm amo amr aoa aoc aoe aof aok aom aoo aor ar- ara arc are arf ark arm aro arr c-- caa cac cae caf cak cam cao car cca ccc cce ccf cck ccm cco ccr ce- cea cec cee cef cek cem ceo cer cfa cfc cfe cff cfk cfm cfo cfr cka ckc ckm cko cma cmc cme cmf cmk cmm cmo cmr co- coa coc coe cof cok com coo cor cra crc cre crf crk crm cro crr eaa eac eae eaf eak eam eao ear ec- eca ecc ece ecf eck ecm eco ecr eea eec eee eef eek eem eeo eer ef- efa efc efe eff efm efo efr eka ekc eke ekf eko ekr em- ema emc eme emf emk emm emo emr eo- eoa eoc eoe eof eok eom eoo eor era erc ere erf erk erm ero err faa fac fae faf fak fam fao far fca fcc fce fcf fck fcm fco fcr fea fec fee fef fek fem feo fer ffa ffc ffe fff ffk ffm ffo ffr fka fkc fkf fkk fkm fma fmc fme fmf fmm fmo fmr foa foc foe fof fok fom foo for fra frc fre frf frk frm fro frr ka- kaa kac kae kaf kak kam kao kar kca kcc kce kck kcm kcr ke- kea kec kee kef kek kem keo ker kfa kfc kff kfm kfo kkc kke kkk kkm kkr kma kmc kme kmf kmk kmm kmo koa koc koe kof kok kom koo kor kra krc krf krk kro krr m-f m-o m-r maa mac mae maf mak mam mao mar mc- mca mcc mce mcf mck mcm mco mcr mea mec mee mef mek mem meo mer mfa mfc mfe mff mfm mfo mfr mka mkc mke mkk mkm mko mkr mma mmc mme mmf mmk mmm mmo mmr moa moc moe mof mok mom moo mor mra mrc mre mrf mrk mrm mro mrr oaa oac oae oaf oak oam oao oar oc- oca occ ocf ock ocm oco ocr oea oec oee oef oem oeo oer of- ofa ofc ofe off ofm ofo ofr oka okc oke okk oko okr om- oma omc ome omf omm omo omr oo- ooa ooc oof ook oom ooo oor or- ora orc ore orf ork orm oro orr ra- raa rac rae raf rak ram rao rar rca rcc rce rcf rcm rco rcr re- rea rec ree ref rek rem reo rer rfa rfc rfe rff rfk rfm rfo rfr rkc rke rkf rkk rkm rko rma rmc rme rmf rmm rmo rmr roa roc roe rof rok rom roo ror rra rrc rrf rrk rrm rrr