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          but nevertheless can be used separately to build stand alone lexical analyzers.
          The first quick start example describes a stand alone application: counting
          characters, words, and lines in a file, very similar to what the well known
          Unix command <code class="computeroutput"><span class="identifier">wc</span></code> is doing
          (for the full example code see here: <a href="../../../../../example/lex/word_count_functor.cpp" target="_