static L<Web> thoughtSpace_indexedWebs(WebThoughtSpace ts, S... queries) {
  new LL<WebNode> lists;
  for (S q : queries)
    if (!isDollarVar(q))
      lists.add(ts.indexedNodes(q));
  if (empty(lists)) ret ts.webs;
  ret nodesToWebs(shortestList(lists));
}