fff ffm ffn ffo ffr fft fmf fmm fmn fmo fmr fmt fnf fnm fnn fnr fnt fof fom fon foo for fot frf frm frn fro frr frt ftf ftm ftn fto ftr ftt m-f m-o m-r mff mfm mfn mfo mfr mft mmf mmm mmn mmo mmr mmt mnf mnm mnn mno mnr mnt mof mom mon moo mor mot mrf mrm mrn mro mrr mrt mtf mtm mtn mto mtr mtt nff nfn nfo nfr nft nmm nmn nmo nmr nmt nnf nnm nnn nno nnt no- nof nom non noo nor not nrf nrm nrn nro nrr nrt ntf ntm ntn nto ntr ntt of- off ofm ofn ofo ofr oft om- omf omm omn omo omr omt on- onf onn ono onr ont oo- oof oom oon ooo oor oot or- orf orm orn oro orr ort ot- otf otm otn oto otr ott rff rfm rfn rfo rfr rft rmf rmm rmn rmo rmr rmt rnm rnn rno rnr rnt rof rom ron roo ror rot rrf rrm rrn rrr rrt rtf rtm rtn rto rtr rtt tff tfm tfn tfo tfr tft tmf tmm tmn tmo tmr tmt tnf tnm tnn tno tnr tnt to- tof tom ton too tor tot trf trm trn tro trr trt ttf ttm ttn tto ttr ttt