static L<WebNode> ai_index_search_dollarX(Symbol a, Symbol b, Symbol c) {
  Symbol query = isDollarVar(a) ? c : a;
  ret webs_tripleSearch_dollarX(a, b, c, ai_search_indexedWebs(query));
}

static L<WebNode> ai_index_search_dollarX(T3<Symbol> t) {
  ret ai_index_search_dollarX(t.a, t.b, t.c);
}