a-a aaa aaf aak aam aax af- afa aff afk afm afx aka akk akm ama amf amk amm amx ax- axa axk axm axx faa faf fak fam fax ffa fff ffk ffm ffx fka fkf fkk fkm fma fmf fmm fmx fxm fxx ka- kaa kaf kak kam kax kfa kff kfm kfx kkk kkm kma kmf kmk kmm kxm m-f maa maf mak mam max mfa mff mfm mka mkk mkm mkx mma mmf mmk mmm mmx mxa xaa xaf xak xam xfa xfm xfx xma xmf xmk xmm xmx xxx