fff ffi ffm ffs fft ffy fif fii fim fis fit fmf fmi fmm fms fmt fsf fsi fsm fss fst ftf fti ftm fts ftt fty fy- fyi i-f iff ifi ifm ifs ift ify iif iii iim iis iit im- imf imi imm ims imt imy is- isf isi ism iss ist isy itf iti itm its itt ity iym iys iyt iyy m-f mff mfi mfm mfs mft mfy mi- mif mii mim mis mit miy mmf mmi mmm mms mmt msf msi msm mss mst msy mtf mti mtm mts mtt my- myf mym mys myt sff sfi sfm sfs sft sif sii sim sis sit smf smi smm sms smt smy ss- ssf ssi ssm sss sst stf sti stm sts stt sty sy- syi sym sys syt tff tfi tfm tfs tft tif tii tim tis tit tiy tmf tmi tmm tms tmt tmy tsf tsi tsm tss tst tsy ttf tti ttm tts ttt tty tyf tym tys tyt yff yfm yfs yft yif yii yim yis yit ymi ymm yms ymt ysi ysm yss yst ysy ytf ytm yts ytt yyf yys yyt yyy