!7

p {
  new HashSet<S> sentences;
  
  int n = 0;
  for (WikiPage page : indexedSimpleWikipedia_allPages()) {
    sentences.addAll(sentencesAfterLines(page.text));
    if ((++n % 1000) == 0) print(n + " / " + l(sentences));
  }
  
  print(l(sentences));
}