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<IfModule mod_expires.c>
   ExpiresActive On
   ExpiresDefault "access plus 1 seconds"
   ExpiresByType text/html "access plus 600 seconds"
   ExpiresByType text/css "access plus 604800 seconds"
   ExpiresByType text/javascript "access plus 216000 seconds"
   ExpiresByType application/xhtml+xml "access plus 600 seconds"
   ExpiresByType image/jpeg "access plus 2592000 seconds"
   ExpiresByType image/png "access plus 2592000 seconds"
   ExpiresByType etc, etc.
</IfModule>