static WebNode web_findForwardRelated_multiRel(WebNode node, S... relations) {
  if (node == null) null;
  if (empty(relations)) relations = litstringarray("");
  Web web = node.web;
  L<Lisp> labels = web_parseLabels(web, relations);
  for (Pair<WebNode> p : web_relations(web))
    if (p.a == node) {
      WebNode rel = web.getRelationOpt(p);
      if (web_hasOneOfTheLabels(rel, labels))
        ret p.b;
    }
  null;
}