(flex.info.gz) User Code Section

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 5.3 Format of the User Code Section
 ===================================
 
 The user code section is simply copied to `lex.yy.c' verbatim.  It is
 used for companion routines which call or are called by the scanner.
 The presence of this section is optional; if it is missing, the second
 `%%' in the input file may be skipped, too.
 

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