a-a a-i aaa aaf aai aan aao aax af- afa aff afi afn afo afx ai- aia aif aii ain aio aix an- ana anf ani ann ano anx aoa aof aoi aon aoo aox ax- axa axi axn axo axx faa faf fai fan fao fax ffa fff ffi ffn ffo ffx fia fif fii fin fix fna fnf fni fnn fnx foa fof foi fon foo fox fxi fxx i-f ia- iaa iaf iai ian iao ifa iff ifi ifn ifo ifx iia iif iii iin iio iix in- ina inf ini inn ino inx io- ioa iof ioi ion ioo ixi ixn n-i naa naf nai nan nao nax nfa nff nfi nfn nfo nia nif nii nin nio nix nna nnf nni nnn nno no- noa nof noi non noo nox o-i oaa oaf oai oan oao oax of- ofa off ofi ofn ofo ofx oia oif oii oin oio on- ona onf oni onn ono onx oo- ooa oof ooi oon ooo oox ox- oxa oxf oxi oxn oxo oxx xaa xaf xan xfa xfn xfx xia xii xin xio xix xna xno xoa xof xoi xon xoo xox xxi xxo xxx