static S getPluralFromWordHippo(S word) {
  word = toLower(word);
  S html = loadPage("http://www.wordhippo.com/what-is/the-plural-of/" + urlencode(word) + ".html");
  S pat = "The plural form of " + word + " is <b>";
  int i = html.indexOf(pat);
  if (i < 0) null;
  i += l(pat);
  int j = indexOf(html, "</b>", i);
  if (j < 0) null;
  ret substring(html, i, j);
}