fff ffi ffm ffs ffy fif fii fim fis fmf fmi fmm fms fsf fsi fsm fss fy- fyi i-f iff ifi ifm ifs ify iif iii iim iis im- imf imi imm ims imy is- isf isi ism iss isy iym iys iyy m-f mff mfi mfm mfs mfy mi- mif mii mim mis miy mmf mmi mmm mms msf msi msm mss msy my- myf mym mys sff sfi sfm sfs sif sii sim sis smf smi smm sms smy ss- ssf ssi ssm sss sy- syi sym sys yff yfm yfs yif yii yim yis ymi ymm yms ysi ysm yss ysy yyf yys yyy