fff ffm ffn ffr ffs fft fmf fmm fmn fmr fms fmt fnf fnm fnn fnr fns fnt frf frm frn frr frs frt fsf fsm fsn fsr fss fst ftf ftm ftn ftr fts ftt m-f m-r mff mfm mfn mfr mfs mft mmf mmm mmn mmr mms mmt mnf mnm mnn mnr mns mnt mrf mrm mrn mrr mrs mrt msf msm msn msr mss mst mtf mtm mtn mtr mts mtt nff nfn nfr nfs nft nmm nmn nmr nms nmt nnf nnm nnn nns nnt nrf nrm nrn nrr nrs nrt nsf nsm nsn nsr nss nst ntf ntm ntn ntr nts ntt rff rfm rfn rfr rfs rft rmf rmm rmn rmr rms rmt rnm rnn rnr rns rnt rrf rrm rrn rrr rrs rrt rsf rsm rsn rsr rss rst rtf rtm rtn rtr rts rtt sff sfm sfn sfr sfs sft smf smm smn smr sms smt snf snm snn snr sns snt sr- srf srm srn srr srs srt ss- ssf ssm ssn ssr sss sst stf stm stn str sts stt tff tfm tfn tfr tfs tft tmf tmm tmn tmr tms tmt tnf tnm tnn tnr tns tnt trf trm trn trr trs trt tsf tsm tsn tsr tss tst ttf ttm ttn ttr tts ttt