public function getContainmentTreeWithRequestPaths() {
    $tree_by_path = [];

    $tree = $this->getContainmentTree();

    foreach ($tree as $parent => $children) {
      foreach ($children as $child) {
        $tree_by_path[$this->requestPaths[$parent]][] = $this->requestPaths[$child];
      }
    }

    return $tree_by_path;
  }