fff ffi ffo ffs fft ffw fif fii fis fit fof foi foo fos fot fow fsf fsi fso fss fst fsw ftf fti fto fts ftt ftw fwf fwi fwo fws fwt i-f iff ifi ifo ifs ift iif iii iio iis iit iiw io- iof ioi ioo ios iot iow is- isf isi iso iss ist isw itf iti ito its itt iwf iwi iwo iws iwt iww o-i of- off ofi ofo ofs oft ofw oif oii oio ois oit oo- oof ooi ooo oos oot oow os- osf osi oso oss ost osw ot- otf oti oto ots ott otw owf owi owo ows owt oww sff sfi sfo sfs sft sfw sif sii sio sis sit siw sof soi soo sos sot sow ss- ssf ssi sso sss sst ssw stf sti sto sts stt stw swf swi swo sws swt tff tfi tfo tfs tft tfw tif tii tio tis tit tiw to- tof toi too tos tot tow tsf tsi tso tss tst tsw ttf tti tto tts ttt ttw twf twi two tws twt tww wff wfi wfo wfs wft wfw wif wii wis wit wof woi woo wos wot wow wsf wsi wso wss wst wsw wtf wti wto wts wtt wtw wwf wwi wwo wwt www