void setup() {
  // initialize digital pin LED_BUILTIN as an output.
  pinMode(13, OUTPUT);
  pinMode(12, OUTPUT);
  pinMode(11, OUTPUT);
  pinMode(10, OUTPUT);
  pinMode(9, OUTPUT);
  pinMode(8, OUTPUT);
  pinMode(7, OUTPUT);
  pinMode(6, OUTPUT);
  pinMode(5, OUTPUT);
  pinMode(3, OUTPUT);
  pinMode(2, OUTPUT);
  pinMode(1, OUTPUT);
}

// the loop function runs over and over again forever
void loop() {
  digitalWrite(11, HIGH);   // turn the LED on (HIGH is the voltage level)
  digitalWrite(5, HIGH);
  digitalWrite(10, LOW);
  digitalWrite(4, LOW);
  delay(5000);
  digitalWrite(11, LOW);   // turn the LED on (HIGH is the voltage level)
  digitalWrite(5, LOW);
  digitalWrite(12, HIGH);   // turn the LED on (HIGH is the voltage level)
  digitalWrite(6, HIGH);
  delay(5000);
  digitalWrite(12, LOW);   // turn the LED on (HIGH is the voltage level)
  digitalWrite(6, LOW);
  digitalWrite(13, HIGH);   // turn the LED on (HIGH is the voltage level)
  digitalWrite(7, HIGH);
  digitalWrite(8, HIGH);   // turn the LED on (HIGH is the voltage level)
  digitalWrite(1, HIGH);
  delay(5000);
  digitalWrite(8, LOW);   // turn the LED on (HIGH is the voltage level)
  digitalWrite(1, LOW);
  digitalWrite(2, HIGH);   // turn the LED on (HIGH is the voltage level)
  digitalWrite(9, HIGH);
  delay(5000);
  digitalWrite(2, LOW);   // turn the LED on (HIGH is the voltage level)
  digitalWrite(9, LOW);
  digitalWrite(4, HIGH);   // turn the LED on (HIGH is the voltage level)
  digitalWrite(10, HIGH);
  digitalWrite(13, LOW);   // turn the LED on (HIGH is the voltage level)
  digitalWrite(7, LOW);
}