fff ffm ffo ffp ffr fft fmf fmm fmo fmp fmr fmt fof fom foo fop for fot fpm fpo fpp fpr fpt frf frm fro frp frr frt ftf ftm fto ftp ftr ftt m-f m-o m-r mff mfm mfo mfp mfr mft mmf mmm mmo mmp mmr mmt mof mom moo mop mor mot mpf mpm mpo mpp mpr mpt mrf mrm mro mrp mrr mrt mtf mtm mto mtp mtr mtt of- off ofm ofo ofp ofr oft om- omf omm omo omp omr omt oo- oof oom ooo oop oor oot op- opf opm opo opp opr opt or- orf orm oro orp orr ort ot- otf otm oto otp otr ott p-p pff pfm pfo pfp pfr pft pmf pmm pmo pmp pmr pmt pof pom poo pop por pot ppf ppm ppo ppp ppr ppt prf prm pro prp prr prt pt- ptf ptm pto ptp ptr ptt rff rfm rfo rfp rfr rft rmf rmm rmo rmp rmr rmt rof rom roo rop ror rot rpf rpm rpo rpp rpr rpt rrf rrm rrp rrr rrt rtf rtm rto rtp rtr rtt tff tfm tfo tfp tfr tft tmf tmm tmo tmp tmr tmt to- tof tom too top tor tot tpf tpm tpo tpp tpr tpt trf trm tro trp trr trt ttf ttm tto ttp ttr ttt