a-a aaa aaf aak aam aao aas aax af- afa aff afk afm afo afs afx aka akk akm ako aks ama amf amk amm amo ams amx aoa aof aok aom aoo aos aox as- asa asf ask asm aso ass asx ax- axa axk axm axo axs axx faa faf fak fam fao fas fax ffa fff ffk ffm ffo ffs ffx fka fkf fkk fkm fma fmf fmm fmo fms fmx foa fof fok fom foo fos fox fsa fsf fsk fsm fso fss fsx fxm fxs fxx ka- kaa kaf kak kam kao kas kax kfa kff kfm kfo kfs kfx kkk kkm kks kma kmf kmk kmm kmo kms koa kof kok kom koo kos ksa ksf ksk ksm kso kss kxm kxo m-f m-o maa maf mak mam mao mas max mfa mff mfm mfo mfs mka mkk mkm mko mks mkx mma mmf mmk mmm mmo mms mmx moa mof mok mom moo mos mox msa msf msk msm mso mss msx mxa mxs oaa oaf oak oam oao oas oax of- ofa off ofm ofo ofs ofx oka okk oko oks om- oma omf omm omo oms omx oo- ooa oof ook oom ooo oos oox os- osa osf osk osm oso oss osx ox- oxa oxf oxo oxx saa saf sak sam sao sas sax sfa sff sfk sfm sfo sfs sfx sk- ska skf skk skm sko sks skx sma smf smk smm smo sms smx soa sof sok som soo sos sox ss- ssa ssf ssk ssm sso sss ssx sxm sxs xaa xaf xak xam xas xfa xfm xfs xfx xks xma xmf xmk xmm xmo xms xmx xoa xof xok xom xoo xos xox xsa xsm xss xxo xxx