fff ffn ffo ffr fft ffu fnf fnn fnr fnt fnu fof fon foo for fot fou frf frn fro frr frt fru ftf ftn fto ftr ftt ftu fuf fun fuo fur fut fuu nff nfn nfo nfr nft nfu nnf nnn nno nnt nnu no- nof non noo nor not nou nrf nrn nro nrr nrt nru ntf ntn nto ntr ntt ntu nun nuo nur nut nuu of- off ofn ofo ofr oft ofu on- onf onn ono onr ont onu oo- oof oon ooo oor oot or- orf orn oro orr ort oru ot- otf otn oto otr ott otu ou- ouf oun ouo our out rff rfn rfo rfr rft rfu rnn rno rnr rnt rnu rof ron roo ror rot rou rrf rrn rrr rrt rru rtf rtn rto rtr rtt rtu ruf run ruo rur rut ruu tff tfn tfo tfr tft tfu tnf tnn tno tnr tnt to- tof ton too tor tot tou trf trn tro trr trt tru ttf ttn tto ttr ttt ttu tuf tun tuo tur tut tuu uff ufn ufo ufr uft ufu un- unf unn uno unr unt unu uon uoo uor uot ur- urf urn uro urr urt uru utf utn uto utr utt utu uun uur uut uuu