static int ai_speculate_all(S prefix) {
  int n = websMadeInThread();
  for ping (S key : allIndexedTermsStartingWith(prefix)) {
    for ping (S word : ai_expandShortenedKeys(key)) {
      ai_speculate(word);
    }
  }
  ret websMadeInThread()-n;
}

static int ai_speculate_all() {
  ret ai_speculate_all("");
}