fff ffm ffn ffo ffr ffs ffx ffy fmf fmm fmn fmo fmr fms fmx fnf fnm fnn fnr fns fnx fof fom fon foo for fos fox foy frf frm frn fro frr frs fry fsf fsm fsn fso fsr fss fsx fxm fxr fxs fxx fy- fyn fyo m-f m-o m-r mff mfm mfn mfo mfr mfs mfy mmf mmm mmn mmo mmr mms mmx mnf mnm mnn mno mnr mns mof mom mon moo mor mos mox moy mrf mrm mrn mro mrr mrs mrx mry msf msm msn mso msr mss msx msy mxn mxr mxs my- myf mym myn myo myr mys myx nff nfn nfo nfr nfs nmm nmn nmo nmr nms nnf nnm nnn nno nns no- nof nom non noo nor nos nox noy nrf nrm nrn nro nrr nrs nrx nry nsf nsm nsn nso nsr nss nsx nsy nyf nym nyn nyo nys nyx nyy of- off ofm ofn ofo ofr ofs ofx om- omf omm omn omo omr oms omx omy on- onf onn ono onr ons onx ony oo- oof oom oon ooo oor oos oox or- orf orm orn oro orr ors orx ory os- osf osm osn oso osr oss osx ox- oxf oxn oxo oxx oxy oyo oys rff rfm rfn rfo rfr rfs rmf rmm rmn rmo rmr rms rmx rnm rnn rno rnr rns rny rof rom ron roo ror ros rox roy rrf rrm rrn rrr rrs rsf rsm rsn rso rsr rss rsx rxr rxs ry- ryf rym ryn ryo ryr rys ryy sff sfm sfn sfo sfr sfs sfx smf smm smn smo smr sms smx smy snf snm snn sno snr sns sny sof som son soo sor sos sox soy sr- srf srm srn sro srr srs srx sry ss- ssf ssm ssn sso ssr sss ssx sxm sxn sxs sy- sym syn syr sys syx xfm xfn xfs xfx xmf xmm xmo xmr xms xmx xno xns xof xom xon xoo xor xos xox xrf xrx xry xsm xss xxo xxx xxy xyr xyy yff yfm yfr yfs ymm ymo yms ynn yns yny yof yom yon yoo yor yos yox yoy yrf yrn yro yrs ysm yso ysr yss ysy yxy yyf yys yyy