fff ffm ffn ffo ffs ffy fmf fmm fmn fmo fms fnf fnm fnn fns fof fom fon foo fos foy fsf fsm fsn fso fss fy- fyn fyo m-f m-o mff mfm mfn mfo mfs mfy mmf mmm mmn mmo mms mnf mnm mnn mno mns mof mom mon moo mos moy msf msm msn mso mss msy my- myf mym myn myo mys nff nfn nfo nfs nmm nmn nmo nms nnf nnm nnn nno nns no- nof nom non noo nos noy nsf nsm nsn nso nss nsy nyf nym nyn nyo nys nyy of- off ofm ofn ofo ofs om- omf omm omn omo oms omy on- onf onn ono ons ony oo- oof oom oon ooo oos os- osf osm osn oso oss oyo oys sff sfm sfn sfo sfs smf smm smn smo sms smy snf snm snn sno sns sny sof som son soo sos soy ss- ssf ssm ssn sso sss sy- sym syn sys yff yfm yfs ymm ymo yms ynn yns yny yof yom yon yoo yos yoy ysm yso yss ysy yyf yys yyy