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There are 256 internal codes in classical TeX and pdfTeX and you can set arbitrary subset of them as letters (catcode 11). Then such characters can be used in control sequences. There are many thousands of internal codes (from Unicode) possible in LuaTeX and XeTeX. If you set (for example) cyrillic as letters then you can use them in control sequences. ...


2

You have probably improper encodig. After switching to UTF-8 all characters in problem are visible. \documentclass[a4paper,twoside,12pt, plain]{report} \usepackage{fontspec} \usepackage[french]{babel} \usepackage{xspace} \usepackage{graphicx} %For loading graphic files \usepackage{enumitem} \usepackage{float} \usepackage{hyperref} \usepackage{epsfig} ...


3

You have improper encoding: UTF-16 instead of expected UTF-8. It may be still visible in your graphic editor, but makes a false input to the pdflatex (e.g.) program.



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