static Pair<Long, S> lastVoiceOutputEndBeforeTimestamp(long timestamp) null on exception {
  temp ReversedLinesFileReader reader = reversedLinesFileReader(cereprocLog());
  S s;
  while ((s = reader.readLine()) != null) {
    if (!isProperlyQuoted(s)) continue;
    s = unquote(s);
    Map map = safeUnstructMap(dropUntilSpace(s));
    if (!eq(map.get("action"), "End talking")) continue;
    long timestamp2 = parseLong(beforeSpace(s));
    if (timestamp2 > timestamp) continue;
    S textSaid = (S) map.get("text");
    ret pair(timestamp-timestamp2, textSaid);
  }
  null;
}