fff ffi ffo ffp ffs fft ffy fif fii fip fis fit fof foi foo fop fos fot foy fpi fpo fpp fps fpt fpy fsf fsi fso fsp fss fst ftf fti fto ftp fts ftt fty fy- fyi fyo fyp i-f iff ifi ifo ifp ifs ift ify iif iii iio iip iis iit io- iof ioi ioo iop ios iot ipf ipi ipo ipp ips ipt ipy is- isf isi iso isp iss ist isy itf iti ito itp its itt ity iyo iys iyt iyy o-i of- off ofi ofo ofp ofs oft oif oii oio oip ois oit oo- oof ooi ooo oop oos oot op- opf opi opo opp ops opt opy os- osf osi oso osp oss ost ot- otf oti oto otp ots ott oyi oyo oys p-p pff pfi pfo pfp pfs pft pfy pif pii pio pip pis pit pof poi poo pop pos pot poy ppf ppi ppo ppp pps ppt ps- psf psi pso psp pss pst psy pt- ptf pti pto ptp pts ptt pty py- pyf pyo pys pyt sff sfi sfo sfp sfs sft sif sii sio sip sis sit sof soi soo sop sos sot soy spf spi spo spp sps spt spy ss- ssf ssi sso ssp sss sst stf sti sto stp sts stt sty sy- syi syp sys syt tff tfi tfo tfp tfs tft tif tii tio tip tis tit tiy to- tof toi too top tos tot toy tpf tpi tpo tpp tps tpt tsf tsi tso tsp tss tst tsy ttf tti tto ttp tts ttt tty tyf tyo typ tys tyt yff yfs yft yif yii yio yip yis yit yof yoi yoo yop yos yot yoy ypf ypo yps ysi yso ysp yss yst ysy ytf yto ytp yts ytt yyf yys yyt yyy