fff ffm ffn ffo ffp ffs fft fmf fmm fmn fmo fmp fms fmt fnf fnm fnn fnp fns fnt fof fom fon foo fop fos fot fpm fpn fpo fpp fps fpt fsf fsm fsn fso fsp fss fst ftf ftm ftn fto ftp fts ftt m-f m-o mff mfm mfn mfo mfp mfs mft mmf mmm mmn mmo mmp mms mmt mnf mnm mnn mno mnp mns mnt mof mom mon moo mop mos mot mpf mpm mpn mpo mpp mps mpt msf msm msn mso msp mss mst mtf mtm mtn mto mtp mts mtt nff nfn nfo nfp nfs nft nmm nmn nmo nmp nms nmt nnf nnm nnn nno nnp nns nnt no- nof nom non noo nop nos not npf npm npn npo npp nps npt nsf nsm nsn nso nsp nss nst ntf ntm ntn nto ntp nts ntt of- off ofm ofn ofo ofp ofs oft om- omf omm omn omo omp oms omt on- onf onn ono onp ons ont oo- oof oom oon ooo oop oos oot op- opf opm opn opo opp ops opt os- osf osm osn oso osp oss ost ot- otf otm otn oto otp ots ott p-p pff pfm pfn pfo pfp pfs pft pmf pmm pmn pmo pmp pms pmt pn- pnf pnm pnn pno pnp pns pnt pof pom pon poo pop pos pot ppf ppm ppn ppo ppp pps ppt ps- psf psm psn pso psp pss pst pt- ptf ptm ptn pto ptp pts ptt sff sfm sfn sfo sfp sfs sft smf smm smn smo smp sms smt snf snm snn sno snp sns snt sof som son soo sop sos sot spf spm spn spo spp sps spt ss- ssf ssm ssn sso ssp sss sst stf stm stn sto stp sts stt tff tfm tfn tfo tfp tfs tft tmf tmm tmn tmo tmp tms tmt tnf tnm tnn tno tnp tns tnt to- tof tom ton too top tos tot tpf tpm tpn tpo tpp tps tpt tsf tsm tsn tso tsp tss tst ttf ttm ttn tto ttp tts ttt