int value;
int x;
#define BUTTON 13
const int buttonPin = 13;
const int ledPin = 11;
const int ledPin2 = 10;
int buttonState13 = 0;
void setup() {
  pinMode(2, OUTPUT);
  pinMode(3, OUTPUT);
  pinMode(4, OUTPUT);
  pinMode(5, OUTPUT);
  pinMode(6, OUTPUT);
  pinMode(7, OUTPUT);
  pinMode(8, OUTPUT);
  pinMode(9, OUTPUT);
  pinMode(10, OUTPUT);
  pinMode(11, OUTPUT);
  pinMode(13, INPUT);
  randomSeed(2);
  Serial.begin(9600);
  x = 0;
  pinMode(ledPin, OUTPUT);
  pinMode(ledPin2, OUTPUT);
  pinMode(buttonPin, INPUT);
}

void loop() {
  buttonState13 = digitalRead(13);

  if (buttonState13 == LOW) {
    for (int i = 2; i < 11; i++) {
    digitalWrite(i, HIGH);
    delay(250);
    digitalWrite(i, LOW);
  }
  for (int i = 11; i > 2; i--) {
    digitalWrite(i, HIGH);
    delay(250);
    digitalWrite(i, LOW);
  }
}
  if (buttonState13 == HIGH) {
  value = random(2, 12);
  digitalWrite(value, HIGH);
  delay(250);
  digitalWrite(value, LOW);
}}
 // }}
  /*else {
    // turn LED off:
    digitalWrite(ledPin, LOW);
    digitalWrite(ledPin2, HIGH);}
  //delay(10);
  }
  /*
  buttonState = digitalRead(BUTTON);
  //if (buttonState == LOW) {
    //digitalWrite(11, HIGH);
    //delay(100);}
  if (buttonState == HIGH) {
    //digitalWrite(11, LOW);
    x++;
    Serial.println(x);
    delay(1000);}
  if (x % 2 == 0) {
    digitalWrite(11, HIGH);
    delay(100);
  }
  if (x % 2 == 1) {
    digitalWrite(11, LOW);
    delay(100);
  }
  //digitalWrite(LED_BUILTIN, buttonState);
}

/*  for (int i = 2; i < 12; i++) {
    digitalWrite(i, HIGH);
    delay(250);
    digitalWrite(i, LOW);
  }
  for (int i = 11; i > 1; i--) {
    digitalWrite(i, HIGH);
    delay(250);
    digitalWrite(i, LOW);
  }
}
/*
void loop() {
  value = random(2, 12);
  digitalWrite(value, HIGH);
  delay(250);
  digitalWrite(value, LOW);
}*/