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Dual quoting delimiters

In contrast to escape sequences and escape characters, dual delimiters provide yet another way to avoid delimiter collision. Some languages, for example, allow the use of either a single quote (') or a double quote (") to specify a string literal. For example, in Perl:

print 'Nancy said "Hello World!" to the crowd.';

produces the desired output without requiring escapes. This approach, however, only works when the string

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