fff ffi ffn ffo ffp ffs fft ffx fif fii fin fip fis fit fix fnf fni fnn fnp fns fnt fnx fof foi fon foo fop fos fot fox fpi fpn fpo fpp fps fpt fpx fsf fsi fsn fso fsp fss fst fsx ftf fti ftn fto ftp fts ftt ftx fxi fxp fxs fxt fxx i-f iff ifi ifn ifo ifp ifs ift ifx iif iii iin iio iip iis iit iix in- inf ini inn ino inp ins int inx io- iof ioi ion ioo iop ios iot ipf ipi ipn ipo ipp ips ipt ipx is- isf isi isn iso isp iss ist itf iti itn ito itp its itt itx ixi ixn n-i nff nfi nfn nfo nfp nfs nft nif nii nin nio nip nis nit nix nnf nni nnn nno nnp nns nnt no- nof noi non noo nop nos not nox npf npi npn npo npp nps npt nsf nsi nsn nso nsp nss nst nsx ntf nti ntn nto ntp nts ntt ntx nxt o-i of- off ofi ofn ofo ofp ofs oft ofx oif oii oin oio oip ois oit on- onf oni onn ono onp ons ont onx oo- oof ooi oon ooo oop oos oot oox op- opf opi opn opo opp ops opt opx os- osf osi osn oso osp oss ost osx ot- otf oti otn oto otp ots ott ox- oxf oxi oxn oxo oxt oxx p-p pff pfi pfn pfo pfp pfs pft pfx pif pii pin pio pip pis pit pix pn- pnf pni pnn pno pnp pns pnt pnx pof poi pon poo pop pos pot pox ppf ppi ppn ppo ppp pps ppt ppx ps- psf psi psn pso psp pss pst psx pt- ptf pti ptn pto ptp pts ptt ptx pxs pxt sff sfi sfn sfo sfp sfs sft sfx sif sii sin sio sip sis sit six snf sni snn sno snp sns snt sof soi son soo sop sos sot sox spf spi spn spo spp sps spt spx ss- ssf ssi ssn sso ssp sss sst ssx stf sti stn sto stp sts stt stx sxi sxn sxs sxt t-x tff tfi tfn tfo tfp tfs tft tfx tif tii tin tio tip tis tit tix tnf tni tnn tno tnp tns tnt tnx to- tof toi ton too top tos tot tox tpf tpi tpn tpo tpp tps tpt tpx tsf tsi tsn tso tsp tss tst tsx ttf tti ttn tto ttp tts ttt ttx txf txi txn txs txt xfn xfs xft xfx xii xin xio xis xit xix xno xns xof xoi xon xoo xop xos xot xox xpf xpn xpo xpp xps xpt xsi xsp xss xst xtf xti xtp xts xtx xxi xxo xxp xxx