a-a a-c aaa aac aae aaf aam aao ac- aca acc ace acf acm aco aea aec aee aef aem aeo af- afa afc afe aff afm afo ama amc ame amf amm amo aoa aoc aoe aof aom aoo c-- caa cac cae caf cam cao cca ccc cce ccf ccm cco ce- cea cec cee cef cem ceo cfa cfc cfe cff cfm cfo cma cmc cme cmf cmm cmo co- coa coc coe cof com coo eaa eac eae eaf eam eao ec- eca ecc ece ecf ecm eco eea eec eee eef eem eeo ef- efa efc efe eff efm efo em- ema emc eme emf emm emo eo- eoa eoc eoe eof eom eoo faa fac fae faf fam fao fca fcc fce fcf fcm fco fea fec fee fef fem feo ffa ffc ffe fff ffm ffo fma fmc fme fmf fmm fmo foa foc foe fof fom foo m-f m-o maa mac mae maf mam mao mc- mca mcc mce mcf mcm mco mea mec mee mef mem meo mfa mfc mfe mff mfm mfo mma mmc mme mmf mmm mmo moa moc moe mof mom moo oaa oac oae oaf oam oao oc- oca occ ocf ocm oco oea oec oee oef oem oeo of- ofa ofc ofe off ofm ofo om- oma omc ome omf omm omo oo- ooa ooc oof oom ooo