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<?php
//* Do NOT include the opening php tag shown above. Copy the code shown below.

<!-- You can also remove sub menus. You can find the sub menu names in wp-admin/menu.php -->

<br />
function remove_submenus() {<br />
  global $submenu;<br />
    unset($submenu['index.php'][10]); // Removes 'Updates'.<br />
    unset($submenu['themes.php'][5]); // Removes 'Themes'.<br />
    unset($submenu['options-general.php'][15]); // Removes 'Writing'.<br />
    unset($submenu['options-general.php'][25]); // Removes 'Discussion'.<br />
}<br />
add_action('admin_menu', 'remove_submenus');<br />