fff ffl ffm ffs fft flf fll flm fls flt fmf fml fmm fms fmt fsf fsl fsm fss fst ftf ftl ftm fts ftt lff lfl lfm lfs lft llf lll llm lls llt lmf lml lmm lms lmt lsf lsl lsm lss lst ltf ltl ltm lts ltt m-f mff mfl mfm mfs mft mlf mll mlm mls mlt mmf mml mmm mms mmt msf msl msm mss mst mtf mtl mtm mts mtt sff sfl sfm sfs sft slf sll slm sls slt smf sml smm sms smt ss- ssf ssl ssm sss sst stf stl stm sts stt tff tfl tfm tfs tft tlf tll tlm tls tlt tmf tml tmm tms tmt tsf tsl tsm tss tst ttf ttl ttm tts ttt