fff ffm ffr ffs ffy fmf fmm fmr fms frf frm frr frs fry fsf fsm fsr fss fy- m-f m-r mff mfm mfr mfs mfy mmf mmm mmr mms mrf mrm mrr mrs mry msf msm msr mss msy my- myf mym myr mys rff rfm rfr rfs rmf rmm rmr rms rrf rrm rrr rrs rsf rsm rsr rss ry- ryf rym ryr rys ryy sff sfm sfr sfs smf smm smr sms smy sr- srf srm srr srs sry ss- ssf ssm ssr sss sy- sym syr sys yff yfm yfr yfs ymm yms yrf yrs ysm ysr yss ysy yyf yys yyy