fff ffi ffp ffs fft ffy fif fii fip fis fit fpi fpp fps fpt fpy fsf fsi fsp fss fst ftf fti ftp fts ftt fty fy- fyi fyp i-f iff ifi ifp ifs ift ify iif iii iip iis iit ipf ipi ipp ips ipt ipy is- isf isi isp iss ist isy itf iti itp its itt ity iys iyt iyy p-p pff pfi pfp pfs pft pfy pif pii pip pis pit ppf ppi ppp pps ppt ps- psf psi psp pss pst psy pt- ptf pti ptp pts ptt pty py- pyf pys pyt sff sfi sfp sfs sft sif sii sip sis sit spf spi spp sps spt spy ss- ssf ssi ssp sss sst stf sti stp sts stt sty sy- syi syp sys syt tff tfi tfp tfs tft tif tii tip tis tit tiy tpf tpi tpp tps tpt tsf tsi tsp tss tst tsy ttf tti ttp tts ttt tty tyf typ tys tyt yff yfs yft yif yii yip yis yit ypf yps ysi ysp yss yst ysy ytf ytp yts ytt yyf yys yyt yyy