fff ffn ffo ffs fft ffu fnf fnn fns fnt fnu fof fon foo fos fot fou fsf fsn fso fss fst fsu ftf ftn fto fts ftt ftu fuf fun fuo fus fut fuu nff nfn nfo nfs nft nfu nnf nnn nno nns nnt nnu no- nof non noo nos not nou nsf nsn nso nss nst nsu ntf ntn nto nts ntt ntu nun nuo nus nut nuu of- off ofn ofo ofs oft ofu on- onf onn ono ons ont onu oo- oof oon ooo oos oot os- osf osn oso oss ost osu ot- otf otn oto ots ott otu ou- ouf oun ouo ous out sff sfn sfo sfs sft sfu snf snn sno sns snt snu sof son soo sos sot sou ss- ssf ssn sso sss sst ssu stf stn sto sts stt stu suf sun suo sus sut suu tff tfn tfo tfs tft tfu tnf tnn tno tns tnt to- tof ton too tos tot tou tsf tsn tso tss tst tsu ttf ttn tto tts ttt ttu tuf tun tuo tus tut tuu uff ufn ufo ufs uft ufu un- unf unn uno uns unt unu uon uoo uos uot usf usn uso uss ust usu utf utn uto uts utt utu uun uus uut uuu