a-a a-c aaa aac aaf aam aan aao ac- aca acc acf acm acn aco af- afa afc aff afm afn afo ama amc amf amm amn amo an- ana anc anf anm ann ano aoa aoc aof aom aon aoo c-- caa cac caf cam can cao cca ccc ccf ccm ccn cco cfa cfc cff cfm cfn cfo cma cmc cmf cmm cmn cmo cn- cna cnc cnf cnm cnn cno co- coa coc cof com con coo faa fac faf fam fan fao fca fcc fcf fcm fcn fco ffa ffc fff ffm ffn ffo fma fmc fmf fmm fmn fmo fna fnc fnf fnm fnn foa foc fof fom fon foo m-f m-o maa mac maf mam man mao mc- mca mcc mcf mcm mcn mco mfa mfc mff mfm mfn mfo mma mmc mmf mmm mmn mmo mna mnc mnf mnm mnn mno moa moc mof mom mon moo naa nac naf nam nan nao nca ncc ncf ncm ncn nco nfa nfc nff nfn nfo nma nmc nmm nmn nmo nna nnc nnf nnm nnn nno no- noa noc nof nom non noo oaa oac oaf oam oan oao oc- oca occ ocf ocm ocn oco of- ofa ofc off ofm ofn ofo om- oma omc omf omm omn omo on- ona onc onf onn ono oo- ooa ooc oof oom oon ooo