fff ffi ffk ffo ffr fft fif fii fik fir fit fkf fki fkk fkt fof foi fok foo for fot frf fri frk fro frr frt ftf fti ftk fto ftr ftt i-f iff ifi ifo ifr ift iif iii iio iir iit ikf iki ikk iko ikr ikt io- iof ioi ioo ior iot ir- irf iri irk iro irr irt itf iti itk ito itt k-t kff kfi kfo kif kii kik kio kir kit kki kkk kkr kkt kof koi kok koo kor kot krf kri krk kro krr krt ktf ktk kto ktr ktt o-i of- off ofi ofo ofr oft oif oii oik oio oir oit oki okk oko okr oo- oof ooi ook ooo oor oot or- orf ori ork oro orr ort ot- otf oti otk oto otr ott rff rfi rfk rfo rfr rft rif rii rik rio rir rit rkf rkk rko rkt rof roi rok roo ror rot rrf rri rrk rrr rrt rtf rti rtk rto rtr rtt tff tfi tfk tfo tfr tft tif tii tik tio tir tit tkk tko tkr tkt to- tof toi tok too tor tot trf tri trk tro trr trt ttf tti ttk tto ttr ttt