a-a aaa aaf aam aar aas af- afa aff afm afr afs ama amf amm amr ams ar- ara arf arm arr ars as- asa asf asm asr ass faa faf fam far fas ffa fff ffm ffr ffs fma fmf fmm fmr fms fra frf frm frr frs fsa fsf fsm fsr fss m-f m-r maa maf mam mar mas mfa mff mfm mfr mfs mma mmf mmm mmr mms mra mrf mrm mrr mrs msa msf msm msr mss ra- raa raf ram rar ras rfa rff rfm rfr rfs rma rmf rmm rmr rms rra rrf rrm rrr rrs rsa rsf rsm rsr rss saa saf sam sar sas sfa sff sfm sfr sfs sma smf smm smr sms sr- sra srf srm srr srs ss- ssa ssf ssm ssr sss