fff ffi ffn ffo ffp ffs fft fif fii fin fip fis fit fnf fni fnn fnp fns fnt fof foi fon foo fop fos fot fpi fpn fpo fpp fps fpt fsf fsi fsn fso fsp fss fst ftf fti ftn fto ftp fts ftt i-f iff ifi ifn ifo ifp ifs ift iif iii iin iio iip iis iit in- inf ini inn ino inp ins int io- iof ioi ion ioo iop ios iot ipf ipi ipn ipo ipp ips ipt is- isf isi isn iso isp iss ist itf iti itn ito itp its itt n-i nff nfi nfn nfo nfp nfs nft nif nii nin nio nip nis nit nnf nni nnn nno nnp nns nnt no- nof noi non noo nop nos not npf npi npn npo npp nps npt nsf nsi nsn nso nsp nss nst ntf nti ntn nto ntp nts ntt o-i of- off ofi ofn ofo ofp ofs oft oif oii oin oio oip ois oit on- onf oni onn ono onp ons ont oo- oof ooi oon ooo oop oos oot op- opf opi opn opo opp ops opt os- osf osi osn oso osp oss ost ot- otf oti otn oto otp ots ott p-p pff pfi pfn pfo pfp pfs pft pif pii pin pio pip pis pit pn- pnf pni pnn pno pnp pns pnt pof poi pon poo pop pos pot ppf ppi ppn ppo ppp pps ppt ps- psf psi psn pso psp pss pst pt- ptf pti ptn pto ptp pts ptt sff sfi sfn sfo sfp sfs sft sif sii sin sio sip sis sit snf sni snn sno snp sns snt sof soi son soo sop sos sot spf spi spn spo spp sps spt ss- ssf ssi ssn sso ssp sss sst stf sti stn sto stp sts stt tff tfi tfn tfo tfp tfs tft tif tii tin tio tip tis tit tnf tni tnn tno tnp tns tnt to- tof toi ton too top tos tot tpf tpi tpn tpo tpp tps tpt tsf tsi tsn tso tsp tss tst ttf tti ttn tto ttp tts ttt