String zun = "ZUN";
String doko = "DOKO";
String kiyoshi = "KI YO SHI!";
String[] expectedReversed = {doko, zun, zun, zun, zun};
String[] history = {};
Boolean preservedShout = false;
Boolean shouted = false;

void setup() {
  size(360, 360);
  background(255);
  frameRate(4);
}
String shout() {
  if (random(1.0) < 0.5) {
    return zun;
  } else {
    return doko;
  }
}
void draw() {
  if (shouted) return;

  background(255);

  float fontSize = random(48)+24; 
  String output = shout();
  if (preservedShout) {
    output = kiyoshi;
    shouted = true;
    fontSize = 70;
  }
  history = (String[])append(history, output);

  Boolean isExpected = false;
  if (history.length >= 5) {
    int count = 0;
    isExpected = true;
    for (int i = history.length-1; i >= history.length - 5; i--) {
      if (expectedReversed[count] != history[i]) {
        isExpected = false;
      }
      count++;
    }
  }
  fill(0);
    textAlign(CENTER);
    textSize(fontSize);
    text(output, width/2, height/2 + fontSize/4);
  noFill();

  if (isExpected) {
    preservedShout = true;
  }
}

참고