static PTElement ai_parseTree_descendToComposite(PTElement e) {
  while (e != null && l(e.children) == 1) {
    PTElement e2 = e;
    e = first(e.children); // Choose most likely reconstruction
    print("Went from " + className(e2) + "(" + e + ") to " + className(e) + " (" + n2(e2.children, "child", "children") + ")");
  }
  ret e;
}