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// Widget Locations
function init_widgets($id) {
   register_sidebar(array(
      'name' => 'Sidebar',
      'id'   => 'sidebar',
      'before_widget'   => '<div class="sidebar-widget">',
      'after_widget'    => '</div>',
      'before_title'    => '<h3>',
      'after_title'     => '</h3>'
   ));
}

add_action('widgets_init', 'init_widgets');