static Set<PairS> storedWebPages_linksContainingText(S baseURL, S pattern) {
  new TreeSet<PairS> links;
  for (S url : storedWebPages_urlsStartingWith(baseURL))
    links.addAll(filterPairB(s -> cic(s, pattern),
      html_linksPlusContents_makeAbsolute(storedWebPage(url), url)));
  ret links;
}