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3.2 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.
The quote characters can be changed at any time, using the builtin
macro `changequote'. Note: Changequote, for more information.
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