fff ffi ffk ffn ffo ffs fft fif fii fik fin fis fit fkf fki fkk fkt fnf fni fnk fnn fns fnt fof foi fok fon foo fos fot fsf fsi fsk fsn fso fss fst ftf fti ftk ftn fto fts ftt i-f iff ifi ifn ifo ifs ift iif iii iin iio iis iit ikf iki ikk iko iks ikt in- inf ini ink inn ino ins int io- iof ioi ion ioo ios iot is- isf isi isk isn iso iss ist itf iti itk itn ito its itt k-t kff kfi kfo kfs kif kii kik kin kio kis kit kki kkk kkn kks kkt kn- knf kni knk knn kno knt kof koi kok kon koo kos kot ksf ksi ksk ksn kso kss kst ktf ktk ktn kto kts ktt n-i nff nfi nfk nfn nfo nfs nft nif nii nik nin nio nis nit nkf nki nkk nkn nko nks nkt nnf nni nnk nnn nno nns nnt no- nof noi nok non noo nos not nsf nsi nsk nsn nso nss nst ntf nti ntk ntn nto nts ntt o-i of- off ofi ofn ofo ofs oft oif oii oik oin oio ois oit oki okk oko oks on- onf oni onk onn ono ons ont oo- oof ooi ook oon ooo oos oot os- osf osi osk osn oso oss ost ot- otf oti otk otn oto ots ott sff sfi sfk sfn sfo sfs sft sif sii sik sin sio sis sit sk- skf ski skk sko sks skt snf sni snk snn sno sns snt sof soi sok son soo sos sot ss- ssf ssi ssk ssn sso sss sst stf sti stk stn sto sts stt tff tfi tfk tfn tfo tfs tft tif tii tik tin tio tis tit tkk tko tks tkt tnf tni tnk tnn tno tns tnt to- tof toi tok ton too tos tot tsf tsi tsk tsn tso tss tst ttf tti ttk ttn tto tts ttt