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(m4.info.gz) Quoted strings

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 2.2 Quoting input to `m4'
 =========================
 
 A quoted string is a sequence of characters surrounded by quote
 strings, defaulting to ``' and `'', where the nested begin and end
 quotes within the string are balanced.  The value of a string token is
 the text, with one level of quotes stripped off.  Thus
 
      `'
      =>
 
 is the empty string, and double-quoting turns into single-quoting.
 
      ``quoted''
      =>`quoted'
 
    The quote characters can be changed at any time, using the builtin
 macro `changequote'.   Changequote, for more information.
 
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