fff ffi ffn ffo ffp fft ffx fif fii fin fip fit fix fnf fni fnn fnp fnt fnx fof foi fon foo fop fot fox fpi fpn fpo fpp fpt fpx ftf fti ftn fto ftp ftt ftx fxi fxp fxt fxx i-f iff ifi ifn ifo ifp ift ifx iif iii iin iio iip iit iix in- inf ini inn ino inp int inx io- iof ioi ion ioo iop iot ipf ipi ipn ipo ipp ipt ipx itf iti itn ito itp itt itx ixi ixn n-i nff nfi nfn nfo nfp nft nif nii nin nio nip nit nix nnf nni nnn nno nnp nnt no- nof noi non noo nop not nox npf npi npn npo npp npt ntf nti ntn nto ntp ntt ntx nxt o-i of- off ofi ofn ofo ofp oft ofx oif oii oin oio oip oit on- onf oni onn ono onp ont onx oo- oof ooi oon ooo oop oot oox op- opf opi opn opo opp opt opx ot- otf oti otn oto otp ott ox- oxf oxi oxn oxo oxt oxx p-p pff pfi pfn pfo pfp pft pfx pif pii pin pio pip pit pix pn- pnf pni pnn pno pnp pnt pnx pof poi pon poo pop pot pox ppf ppi ppn ppo ppp ppt ppx pt- ptf pti ptn pto ptp ptt ptx pxt t-x tff tfi tfn tfo tfp tft tfx tif tii tin tio tip tit tix tnf tni tnn tno tnp tnt tnx to- tof toi ton too top tot tox tpf tpi tpn tpo tpp tpt tpx ttf tti ttn tto ttp ttt ttx txf txi txn txt xfn xft xfx xii xin xio xit xix xno xof xoi xon xoo xop xot xox xpf xpn xpo xpp xpt xtf xti xtp xtx xxi xxo xxp xxx