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// Unregister WordPress default widgets
add_action('widgets_init', 'unregister_default_widgets', 11);
function unregister_default_widgets() {
     unregister_widget('WP_Widget_Pages');
     unregister_widget('WP_Widget_Calendar');
     unregister_widget('WP_Widget_Archives');
     unregister_widget('WP_Widget_Links');
     unregister_widget('WP_Widget_Meta');
/*      unregister_widget('WP_Widget_Search'); */
/*      unregister_widget('WP_Widget_Text'); */
     unregister_widget('WP_Widget_Categories');
/*      unregister_widget('WP_Widget_Recent_Posts'); */
     unregister_widget('WP_Widget_Recent_Comments');
     unregister_widget('WP_Widget_RSS');
     unregister_widget('WP_Widget_Tag_Cloud');
/*      unregister_widget('WP_Nav_Menu_Widget'); */
     unregister_widget('Twenty_Eleven_Ephemera_Widget');
}