static L<WebNode> webs_tripleSearch_dollarX(S a, S b, S c, Collection<Web> webs) {
  new L<Map<WebNode>> mappings;
  for (Web web : webs)
    addIfNotNull(mappings, web_matchTriple_dollarVars(a, b, c, web));
  ret getFromAll(mappings, web_findNode(searchWeb, "$X"));
}