fff ffk ffo ffr ffs fft ffw fkf fkk fkt fof fok foo for fos fot fow frf frk fro frr frs frt frw fsf fsk fso fsr fss fst fsw ftf ftk fto ftr fts ftt ftw fwf fwo fws fwt k-t kff kfo kfs kfw kkk kkr kks kkt kof kok koo kor kos kot kow krf krk kro krr krs krt krw ksf ksk kso ksr kss kst ksw ktf ktk kto ktr kts ktt ktw kw- kwf kwk kwo kws kwt kww of- off ofo ofr ofs oft ofw okk oko okr oks okw oo- oof ook ooo oor oos oot oow or- orf ork oro orr ors ort os- osf osk oso osr oss ost osw ot- otf otk oto otr ots ott otw owf owk owo ows owt oww rff rfk rfo rfr rfs rft rfw rkf rkk rko rks rkt rof rok roo ror ros rot row rrf rrk rrr rrs rrt rsf rsk rso rsr rss rst rsw rtf rtk rto rtr rts rtt rtw rwf rwr rws sff sfk sfo sfr sfs sft sfw sk- skf skk sko skr sks skt skw sof sok soo sor sos sot sow sr- srf srk sro srr srs srt srw ss- ssf ssk sso ssr sss sst ssw stf stk sto str sts stt stw swf swk swo swr sws swt tff tfk tfo tfr tfs tft tfw tkk tko tkr tks tkt tkw to- tof tok too tor tos tot tow trf trk tro trr trs trt trw tsf tsk tso tsr tss tst tsw ttf ttk tto ttr tts ttt ttw twf two twr tws twt tww wff wfk wfo wfr wfs wft wfw wkf wko wkr wks wkt wkw wof wok woo wor wos wot wow wr- wrf wrk wro wrr wrs wrt wrw wsf wsk wso wsr wss wst wsw wtf wto wtr wts wtt wtw wwf wwo wwt www