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Write a function to search for a regular expression that matches two
or more blank lines in sequence.
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Write a function to search for duplicated words, such as `the the'.
See section `Syntax of Regular Expressions' in The GNU Emacs Manual, for information on how to write a regexp (a regular
expression) to match a string that is composed of two identical
halves. You can devise several regexps; some are better than others.
The function I use is described in an appendix, along with several
regexps. See section The
the-the Function.
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