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+
+GENERAL INFORMATION
+-------------------
+
+This module implements the Porter-Stemmer algorithm, version 2, to improve
+English-language searching with the Drupal built-in Search module. Information
+about the algorithm can be found at
+http://snowball.tartarus.org/algorithms/english/stemmer.html
+
+Stemming reduces a word to its basic root or stem (e.g. 'blogging' to 'blog') so
+that variations on a word ('blogs', 'blogger', 'blogging', 'blog') are
+considered equivalent when searching. This generally results in more relevant
+results.
+
+Note that a few parts of the Porter Stemmer algorithm work better for American
+English than British English, so some British spellings will not be stemmed
+correctly.
+
+This module will use the PECL "stem" library's implementation of the Porter
+Stemmer algorithm, if it is installed on your server. If the PECL "stem" library
+is not available, the module uses its own PHP implementation of the
+algorithm. The output is the same in either case. More information about the
+PECL "stem" library: http://pecl.php.net/package/stem
+
+
+INSTALLATION
+------------
+
+See the INSTALL.txt file for installation instructions.
+
+
+TESTING
+-------
+
+The Porter Stemmer module includes tests for the stemming algorithm and
+functionality.  If you would like to run the tests, enable the core Testing
+module, and then run the tests following instructions on
+https://www.drupal.org/docs/8/phpunit/running-phpunit-tests. Commands below:
+
+cd core
+../vendor/bin/phpunit --group porterstemmer
+
+
+Each test for the Porter Stemmer module includes approximately
+5000 individual word stemming tests (which test the module against a standard
+word list).
+
+Tests are provided both for the internal algorithm and the PECL library.
+
+There is also a functional test for integration with Drupal search.