MySQL dump file and commented out lines

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I have these lines at the top of a MySQL .sql file (dumped with phpMyAdmin):

/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;
/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;
/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;
/*!40101 SET NAMES utf8 */;

But they all seem to be commented out. So will MySQL ignore them when the file is loaded back into a database? If so, why generate these lines at all?

phpmyadmin mysqldump mysql
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