fff ffi ffs fft ffw fif fii fis fit fsf fsi fss fst fsw ftf fti fts ftt ftw fwf fwi fws fwt i-f iff ifi ifs ift iif iii iis iit iiw is- isf isi iss ist isw itf iti its itt iwf iwi iws iwt iww sff sfi sfs sft sfw sif sii sis sit siw ss- ssf ssi sss sst ssw stf sti sts stt stw swf swi sws swt tff tfi tfs tft tfw tif tii tis tit tiw tsf tsi tss tst tsw ttf tti tts ttt ttw twf twi tws twt tww wff wfi wfs wft wfw wif wii wis wit wsf wsi wss wst wsw wtf wti wts wtt wtw wwf wwi wwt www