int x = 11;
int y = 12;
int z = 13;

void setup() {
  pinMode(x, OUTPUT);
  pinMode(y, OUTPUT);
  pinMode(z, OUTPUT);
}

void loop() {
  digitalWrite(x, HIGH);
  digitalWrite(z, LOW);
  digitalWrite(y, LOW);
  delay(1000);


  digitalWrite(x, LOW);
  digitalWrite(y, HIGH);
  digitalWrite(z, LOW);
  delay(1000);

  digitalWrite(z, HIGH);
  digitalWrite(y, LOW);
  digitalWrite(x, LOW);
  delay(1000);

  digitalWrite(z, LOW);
  digitalWrite(y, LOW);
  digitalWrite(x, LOW);
  delay(1000);

  digitalWrite(z, HIGH);
  digitalWrite(x, HIGH);
  digitalWrite(y, HIGH);
  delay(1000);

  digitalWrite(z, LOW);
  digitalWrite(y, LOW);
  digitalWrite(x, LOW);
  delay(1000);

}