a-a aaa aaf aak aam aao aar aas af- afa aff afk afm afo afr afs aka akk akm ako akr aks ama amf amk amm amo amr ams aoa aof aok aom aoo aor aos ar- ara arf ark arm aro arr ars as- asa asf ask asm aso asr ass faa faf fak fam fao far fas ffa fff ffk ffm ffo ffr ffs fka fkf fkk fkm fma fmf fmm fmo fmr fms foa fof fok fom foo for fos fra frf frk frm fro frr frs fsa fsf fsk fsm fso fsr fss ka- kaa kaf kak kam kao kar kas kfa kff kfm kfo kfs kkk kkm kkr kks kma kmf kmk kmm kmo kms koa kof kok kom koo kor kos kra krf krk kro krr krs ksa ksf ksk ksm kso ksr kss m-f m-o m-r maa maf mak mam mao mar mas mfa mff mfm mfo mfr mfs mka mkk mkm mko mkr mks mma mmf mmk mmm mmo mmr mms moa mof mok mom moo mor mos mra mrf mrk mrm mro mrr mrs msa msf msk msm mso msr mss oaa oaf oak oam oao oar oas of- ofa off ofm ofo ofr ofs oka okk oko okr oks om- oma omf omm omo omr oms oo- ooa oof ook oom ooo oor oos or- ora orf ork orm oro orr ors os- osa osf osk osm oso osr oss ra- raa raf rak ram rao rar ras rfa rff rfk rfm rfo rfr rfs rkf rkk rkm rko rks rma rmf rmm rmo rmr rms roa rof rok rom roo ror ros rra rrf rrk rrm rrr rrs rsa rsf rsk rsm rso rsr rss saa saf sak sam sao sar sas sfa sff sfk sfm sfo sfr sfs sk- ska skf skk skm sko skr sks sma smf smk smm smo smr sms soa sof sok som soo sor sos sr- sra srf srk srm sro srr srs ss- ssa ssf ssk ssm sso ssr sss