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(m4.info)Quoted strings

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Quoted strings
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   A quoted string is a sequence of characters surrounded by the quotes
``' and `'', where the number of start and end quotes within the string
balances.  The value of a string token is the text, with one level of
quotes stripped off.  Thus

     `'

   is the empty string, and

     ``quoted''

   is the string

     `quoted'

   The quote characters can be changed at any time, using the builtin
macro `changequote'.  Note: Changequote for more information.