fff ffi ffo ffp ffr fft fif fii fip fir fit fof foi foo fop for fot fpi fpo fpp fpr fpt frf fri fro frp frr frt ftf fti fto ftp ftr ftt i-f iff ifi ifo ifp ifr ift iif iii iio iip iir iit io- iof ioi ioo iop ior iot ipf ipi ipo ipp ipr ipt ir- irf iri iro irp irr irt itf iti ito itp itt o-i of- off ofi ofo ofp ofr oft oif oii oio oip oir oit oo- oof ooi ooo oop oor oot op- opf opi opo opp opr opt or- orf ori oro orp orr ort ot- otf oti oto otp otr ott p-p pff pfi pfo pfp pfr pft pif pii pio pip pir pit pof poi poo pop por pot ppf ppi ppo ppp ppr ppt prf pri pro prp prr prt pt- ptf pti pto ptp ptr ptt rff rfi rfo rfp rfr rft rif rii rio rip rir rit rof roi roo rop ror rot rpf rpi rpo rpp rpr rpt rrf rri rrp rrr rrt rtf rti rto rtp rtr rtt tff tfi tfo tfp tfr tft tif tii tio tip tir tit to- tof toi too top tor tot tpf tpi tpo tpp tpr tpt trf tri tro trp trr trt ttf tti tto ttp ttr ttt