-er a-a a-c aaa aac aae aag aak aam aao aar ac- aca acc ace acg ack acm aco acr aea aec aee aeg aek aem aeo aer ag- aga agc age agg agk agm ago agr aka akc ake akg akk akm ako akr ama amc ame amg amk amm amo amr aoa aoc aoe aog aok aom aoo aor ar- ara arc are arg ark arm aro arr c-- caa cac cae cag cak cam cao car cca ccc cce ccg cck ccm cco ccr ce- cea cec cee ceg cek cem ceo cer cga cgc cge cgg cgm cgo cgr cka ckc ckm cko cma cmc cme cmg cmk cmm cmo cmr co- coa coc coe cog cok com coo cor cra crc cre crg crk crm cro crr eaa eac eae eag eak eam eao ear ec- eca ecc ece ecg eck ecm eco ecr eea eec eee eeg eek eem eeo eer ega egc ege egg egm ego egr eka ekc eke ekg eko ekr em- ema emc eme emg emk emm emo emr eo- eoa eoc eoe eog eok eom eoo eor era erc ere erg erk erm ero err gaa gac gae gag gak gam gao gar gca gcc gce gcg gck gcm gco gcr ge- gea gec gee geg gek gem geo ger gga ggc ggg ggm ggo ggr gka gkm gko gma gmc gme gmg gmm gmo gmr goa goc goe gog gok gom goo gor gra grc gre grg grk grm gro grr ka- kaa kac kae kag kak kam kao kar kca kcc kce kcg kck kcm kcr ke- kea kec kee keg kek kem keo ker kga kgc kgm kgo kkc kke kkk kkm kkr kma kmc kme kmg kmk kmm kmo koa koc koe kog kok kom koo kor kra krc krg krk kro krr m-o m-r maa mac mae mag mak mam mao mar mc- mca mcc mce mcg mck mcm mco mcr mea mec mee meg mek mem meo mer mga mgc mge mgk mgm mgo mgr mka mkc mke mkg mkk mkm mko mkr mma mmc mme mmg mmk mmm mmo mmr moa moc moe mog mok mom moo mor mra mrc mre mrg mrk mrm mro mrr oaa oac oae oag oak oam oao oar oc- oca occ ocg ock ocm oco ocr oea oec oee oeg oem oeo oer oga ogc oge ogg ogo oka okc oke okg okk oko okr om- oma omc ome omg omm omo omr oo- ooa ooc oog ook oom ooo oor or- ora orc ore org ork orm oro orr ra- raa rac rae rag rak ram rao rar rca rcc rce rcg rcm rco rcr re- rea rec ree reg rek rem reo rer rga rgc rge rgg rgk rgo rgr rkc rke rkg rkk rkm rko rma rmc rme rmg rmm rmo rmr roa roc roe rog rok rom roo ror rra rrc rrg rrk rrm rrr