fff ffi ffl ffm ffx fif fii fil fim fix flf fli fll flm flx fmf fmi fml fmm fmx fxi fxm fxx i-f iff ifi ifl ifm ifx iif iii iil iim iix il- ilf ili ill ilm ilx im- imf imi iml imm imx ixi ixl lff lfi lfl lfm lfx lif lii lil lim lix llf lli lll llm lmf lmi lml lmm lxi lxx m-f mff mfi mfl mfm mi- mif mii mil mim mix mlf mli mll mlm mlx mmf mmi mml mmm mmx mxi mxl xfl xfm xfx xii xix xlf xli xlm xmf xmi xml xmm xmx xxi xxl xxx