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// Do not search these page IDs
function my_search_filter($wp_query) {
   if ($wp_query->is_search) {
      $wp_query->set('post__not_in', array( -25, -94, -27, -5, -18, -90, -87, -92, -16, -23, -36 ) );
   }
   return $wp_query;
}
add_filter('pre_get_posts','my_search_filter');