-er a-a a-c aaa aac aae aaf aag aam aao aar ac- aca acc ace acf acg acm aco acr aea aec aee aef aeg aem aeo aer af- afa afc afe aff afg afm afo afr ag- aga agc age agf agg agm ago agr ama amc ame amf amg amm amo amr aoa aoc aoe aof aog aom aoo aor ar- ara arc are arf arg arm aro arr c-- caa cac cae caf cag cam cao car cca ccc cce ccf ccg ccm cco ccr ce- cea cec cee cef ceg cem ceo cer cfa cfc cfe cff cfg cfm cfo cfr cga cgc cge cgg cgm cgo cgr cma cmc cme cmf cmg cmm cmo cmr co- coa coc coe cof cog com coo cor cra crc cre crf crg crm cro crr eaa eac eae eaf eag eam eao ear ec- eca ecc ece ecf ecg ecm eco ecr eea eec eee eef eeg eem eeo eer ef- efa efc efe eff efg efm efo efr ega egc ege egf egg egm ego egr em- ema emc eme emf emg emm emo emr eo- eoa eoc eoe eof eog eom eoo eor era erc ere erf erg erm ero err faa fac fae faf fag fam fao far fca fcc fce fcf fcg fcm fco fcr fea fec fee fef feg fem feo fer ffa ffc ffe fff ffg ffm ffo ffr fga fgc fge fgf fgg fgm fgr fma fmc fme fmf fmg fmm fmo fmr foa foc foe fof fog fom foo for fra frc fre frf frg frm fro frr gaa gac gae gaf gag gam gao gar gca gcc gce gcf gcg gcm gco gcr ge- gea gec gee gef geg gem geo ger gfa gfc gfe gff gfm gfo gfr gga ggc ggg ggm ggo ggr gma gmc gme gmf gmg gmm gmo gmr goa goc goe gof gog gom goo gor gra grc gre grf grg grm gro grr m-f m-o m-r maa mac mae maf mag mam mao mar mc- mca mcc mce mcf mcg mcm mco mcr mea mec mee mef meg mem meo mer mfa mfc mfe mff mfg mfm mfo mfr mga mgc mge mgf mgm mgo mgr mma mmc mme mmf mmg mmm mmo mmr moa moc moe mof mog mom moo mor mra mrc mre mrf mrg mrm mro mrr oaa oac oae oaf oag oam oao oar oc- oca occ ocf ocg ocm oco ocr oea oec oee oef oeg oem oeo oer of- ofa ofc ofe off ofg ofm ofo ofr oga ogc oge ogf ogg ogo om- oma omc ome omf omg omm omo omr oo- ooa ooc oof oog oom ooo oor or- ora orc ore orf org orm oro orr ra- raa rac rae raf rag ram rao rar rca rcc rce rcf rcg rcm rco rcr re- rea rec ree ref reg rem reo rer rfa rfc rfe rff rfg rfm rfo rfr rga rgc rge rgf rgg rgo rgr rma rmc rme rmf rmg rmm rmo rmr roa roc roe rof rog rom roo ror rra rrc rrf rrg rrm rrr