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function travelportal_search_extra_ranking() {
  return array(
    'node_type_boost_search' => array(
      'title' => t('Travel Portal Node type boost search'),
      'arguments' => array(':node_type_boost' => 'blog,city,tour_package'),
      'score' => ' FIND_IN_SET(n.type, :node_type_boost)',
    ),
  );
}