htaccess repeated code

I have an SEO plugin that has an editor for .htaccess. I had a look at this and noticed that the following code is repeated over 30 times. I think it was put there by a security plugin. Should I delete the repeats?

Thanks

Martin

<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>