fff ffi ffk ffr ffs fft fif fii fik fir fis fit fkf fki fkk fkt frf fri frk frr frs frt fsf fsi fsk fsr fss fst ftf fti ftk ftr fts ftt i-f iff ifi ifr ifs ift iif iii iir iis iit ikf iki ikk ikr iks ikt ir- irf iri irk irr irs irt is- isf isi isk isr iss ist itf iti itk its itt k-t kff kfi kfs kif kii kik kir kis kit kki kkk kkr kks kkt krf kri krk krr krs krt ksf ksi ksk ksr kss kst ktf ktk ktr kts ktt rff rfi rfk rfr rfs rft rif rii rik rir ris rit rkf rkk rks rkt rrf rri rrk rrr rrs rrt rsf rsi rsk rsr rss rst rtf rti rtk rtr rts rtt sff sfi sfk sfr sfs sft sif sii sik sir sis sit sk- skf ski skk skr sks skt sr- srf sri srk srr srs srt ss- ssf ssi ssk ssr sss sst stf sti stk str sts stt tff tfi tfk tfr tfs tft tif tii tik tir tis tit tkk tkr tks tkt trf tri trk trr trs trt tsf tsi tsk tsr tss tst ttf tti ttk ttr tts ttt