a-a a-i aaa aaf aai aan aax af- afa aff afi afn afx ai- aia aif aii ain aix an- ana anf ani ann anx ax- axa axi axn axx faa faf fai fan fax ffa fff ffi ffn ffx fia fif fii fin fix fna fnf fni fnn fnx fxi fxx i-f ia- iaa iaf iai ian ifa iff ifi ifn ifx iia iif iii iin iix in- ina inf ini inn inx ixi ixn n-i naa naf nai nan nax nfa nff nfi nfn nia nif nii nin nix nna nnf nni nnn xaa xaf xan xfa xfn xfx xia xii xin xix xna xxi xxx