a-a a-c aaa aac aae aaf aag aam aao ac- aca acc ace acf acg acm aco aea aec aee aef aeg aem aeo af- afa afc afe aff afg afm afo ag- aga agc age agf agg agm ago ama amc ame amf amg amm amo aoa aoc aoe aof aog aom aoo c-- caa cac cae caf cag cam cao cca ccc cce ccf ccg ccm cco ce- cea cec cee cef ceg cem ceo cfa cfc cfe cff cfg cfm cfo cga cgc cge cgg cgm cgo cma cmc cme cmf cmg cmm cmo co- coa coc coe cof cog com coo eaa eac eae eaf eag eam eao ec- eca ecc ece ecf ecg ecm eco eea eec eee eef eeg eem eeo ef- efa efc efe eff efg efm efo ega egc ege egf egg egm ego em- ema emc eme emf emg emm emo eo- eoa eoc eoe eof eog eom eoo faa fac fae faf fag fam fao fca fcc fce fcf fcg fcm fco fea fec fee fef feg fem feo ffa ffc ffe fff ffg ffm ffo fga fgc fge fgf fgg fgm fma fmc fme fmf fmg fmm fmo foa foc foe fof fog fom foo gaa gac gae gaf gag gam gao gca gcc gce gcf gcg gcm gco ge- gea gec gee gef geg gem geo gfa gfc gfe gff gfm gfo gga ggc ggg ggm ggo gma gmc gme gmf gmg gmm gmo goa goc goe gof gog gom goo m-f m-o maa mac mae maf mag mam mao mc- mca mcc mce mcf mcg mcm mco mea mec mee mef meg mem meo mfa mfc mfe mff mfg mfm mfo mga mgc mge mgf mgm mgo mma mmc mme mmf mmg mmm mmo moa moc moe mof mog mom moo oaa oac oae oaf oag oam oao oc- oca occ ocf ocg ocm oco oea oec oee oef oeg oem oeo of- ofa ofc ofe off ofg ofm ofo oga ogc oge ogf ogg ogo om- oma omc ome omf omg omm omo oo- ooa ooc oof oog oom ooo