fff ffl ffm ffn ffr ffs fft flf fll flm fln flr fls flt fmf fml fmm fmn fmr fms fmt fnf fnl fnm fnn fnr fns fnt frf frl frm frn frr frs frt fsf fsl fsm fsn fsr fss fst ftf ftl ftm ftn ftr fts ftt lff lfl lfm lfn lfr lfs lft llf lll llm lln llr lls llt lmf lml lmm lmn lmr lms lmt lnl lnm lnn lnr lns lnt lrf lrm lrn lrr lrs lrt lsf lsl lsm lsn lsr lss lst ltf ltl ltm ltr lts ltt m-f m-r mff mfl mfm mfn mfr mfs mft mlf mll mlm mln mlr mls mlt mmf mml mmm mmn mmr mms mmt mnf mnl mnm mnn mnr mns mnt mrf mrl mrm mrn mrr mrs mrt msf msl msm msn msr mss mst mtf mtl mtm mtn mtr mts mtt nff nfl nfn nfr nfs nft nlf nll nlm nln nlr nls nlt nml nmm nmn nmr nms nmt nnf nnl nnm nnn nns nnt nrf nrl nrm nrn nrr nrs nrt nsf nsl nsm nsn nsr nss nst ntf ntm ntn ntr nts ntt rff rfl rfm rfn rfr rfs rft rlf rll rlm rln rlr rls rlt rmf rml rmm rmn rmr rms rmt rnm rnn rnr rns rnt rrf rrl rrm rrn rrr rrs rrt rsf rsl rsm rsn rsr rss rst rtf rtl rtm rtn rtr rts rtt sff sfl sfm sfn sfr sfs sft slf sll slm sln slr sls slt smf sml smm smn smr sms smt snf snl snm snn snr sns snt sr- srf srl srm srn srr srs srt ss- ssf ssl ssm ssn ssr sss sst stf stl stm stn str sts stt tff tfl tfm tfn tfr tfs tft tlf tll tlm tln tlr tls tlt tmf tml tmm tmn tmr tms tmt tnf tnl tnm tnn tnr tns tnt trf trl trm trn trr trs trt tsf tsl tsm tsn tsr tss tst ttf ttl ttm ttn ttr tts ttt