fff ffn ffo ffp ffr fft fnf fnn fnp fnr fnt fof fon foo fop for fot fpn fpo fpp fpr fpt frf frn fro frp frr frt ftf ftn fto ftp ftr ftt nff nfn nfo nfp nfr nft nnf nnn nno nnp nnt no- nof non noo nop nor not npf npn npo npp npr npt nrf nrn nro nrp nrr nrt ntf ntn nto ntp ntr ntt of- off ofn ofo ofp ofr oft on- onf onn ono onp onr ont oo- oof oon ooo oop oor oot op- opf opn opo opp opr opt or- orf orn oro orp orr ort ot- otf otn oto otp otr ott p-p pff pfn pfo pfp pfr pft pn- pnf pnn pno pnp pnr pnt pof pon poo pop por pot ppf ppn ppo ppp ppr ppt prf prn pro prp prr prt pt- ptf ptn pto ptp ptr ptt rff rfn rfo rfp rfr rft rnn rno rnp rnr rnt rof ron roo rop ror rot rpf rpn rpo rpp rpr rpt rrf rrn rrp rrr rrt rtf rtn rto rtp rtr rtt tff tfn tfo tfp tfr tft tnf tnn tno tnp tnr tnt to- tof ton too top tor tot tpf tpn tpo tpp tpr tpt trf trn tro trp trr trt ttf ttn tto ttp ttr ttt