static Map<WebNode> web_matchAllPerms_partial_scoreF(Web patternWeb, Web inputWeb, O scoreFunction) {
  L<WebNode> patternNodes = web_nodes(patternWeb);
  L<WebNode> inputNodes = web_nodes(inputWeb);
  if (l(patternNodes) > l(inputNodes))
    null;

  new Best<L<WebNode>> best;
  LL<WebNode> subsets = allSubsetsOfLength(l(patternNodes), inputNodes);
  for (L<WebNode> subset : subsets) {
    LL<WebNode> perms = allPermutations(subset);
    for (L<WebNode> perm : perms)
      best.put(perm, toDouble(callF(scoreFunction, patternNodes, perm)));
  }
  
  L<WebNode> l = best.getIfScoreAbove(0);
  ret l == null ? null : twoListsToOrderedMap(patternNodes, l);
}