static L<WebNode> ai_triplesToWebNodes_lazyList(final Symbol searchTerm, final L<TripleWeb> l) {
  ret new LazyList<WebNode>() {
    final int n = l(l);
    public int size() { ret n; }
    public WebNode get(int i) {
      TripleWeb w = syncGet(l, i);
      if (w == null) null;
      int runLength = 0;
      while (i-runLength > 0 && l.get(i-runLength-1) == w)
        ++runLength;
      ret ai_tripleToWebNode(l.get(i), searchTerm, runLength);
    }
  };
}