fff ffg ffi ffn ffx fgf fgg fgi fgn fif fig fii fin fix fnf fng fni fnn fnx fxg fxi fxx gff gfi gfx ggg ggi ggn gif gig gii gin gnf gni gnn gxf i-f iff ifg ifi ifn ifx igf igg igi ign iif iii iin iix in- inf ing ini inn inx ixi ixn n-i nff nfi nfn ngf ngg ngi ngn nif nig nii nin nix nnf nng nni nnn xfn xfx xgi xii xin xix xxi xxx