a-a a-t aaa aaf aam aas aat af- afa aff afm afs aft ama amf amm ams amt as- asa asf asm ass ast at- ata atf atm ats att faa faf fam fas fat ffa fff ffm ffs fft fma fmf fmm fms fmt fsa fsf fsm fss fst fta ftf ftm fts ftt m-f maa maf mam mas mat mfa mff mfm mfs mft mma mmf mmm mms mmt msa msf msm mss mst mta mtf mtm mts mtt saa saf sam sas sat sfa sff sfm sfs sft sma smf smm sms smt ss- ssa ssf ssm sss sst sta stf stm sts stt taa taf tam tas tat tfa tff tfm tfs tft tma tmf tmm tms tmt tsa tsf tsm tss tst tta ttf ttm tts ttt