void setup() {
  // put your setup code here, to run once:
  pinMode(13, OUTPUT); // Initialize digital pin 13 as an output
  pinMode(12, OUTPUT); // Initialize digital pin 12 as an output
  pinMode(11, OUTPUT); // Initialize digital pin 11 as an output
  pinMode(10, OUTPUT); // Initialize digital pin 10 as an output
  pinMode(9, OUTPUT); // Initialize digital pin 9 as an output
  pinMode(8, OUTPUT); // Initialize digital pin 8 as an output
  pinMode(7, OUTPUT); // Initialize digital pin 7 as an output
  pinMode(6, OUTPUT); // Initialize digital pin 6 as an output
  pinMode(5, OUTPUT); // Initialize digital pin 5 as an output
  pinMode(4, OUTPUT); // Initialize digital pin 4 as an output
}

void loop() {
  // put your main code here, to run repeatedly:

int d; // for delay in sequence 1

  for (int k = 1; k <=7; k++) {
    if (k == 1 || k == 3 || k == 6) {
      d = 500;
    }
    else if (k == 2 || k == 4 || k == 7) {
      d = 100;
        for (int i = 13; i >= 4; i--) {
        digitalWrite(i, HIGH); // Turn LED on
        delay(d);
      }
      for (int j = 4; j <= 13; j++) {
        digitalWrite(j, LOW); // Turn LED off
        delay(d);
      } 
    }
  for (int i = 13; i >= 4; i--) {
    digitalWrite(i, HIGH); // Turn LED on
    delay(d);
  }
  for (int j = 4; j <= 13; j++) {
    digitalWrite(j, LOW); // Turn LED off
    delay(d);
  }
  }

int n; // for delay in sequence 2

  // 2nd Sequence
  for (int i = 1; i <= 4; i++) {
    if (i == 1 || i == 3) {
      n = 300;
    }
    else { 
      n = 800;
    }
    digitalWrite(13, HIGH);
    digitalWrite(12, HIGH);
    delay(n);
    digitalWrite(9, HIGH);
    digitalWrite(8, HIGH);
    delay(n);
    digitalWrite(5, HIGH);
    digitalWrite(4, HIGH);
    delay(n);
    digitalWrite(5, LOW);
    digitalWrite(4, LOW);
    delay(n);
    digitalWrite(9, LOW);
    digitalWrite(8, LOW);
    delay(n);
    digitalWrite(13, LOW);
    digitalWrite(12, LOW);
    delay(n);
    digitalWrite(11, HIGH);
    digitalWrite(10, HIGH);
    delay(n);
    digitalWrite(7, HIGH);
    digitalWrite(6, HIGH);
    delay(n);
    digitalWrite(7, LOW);
    digitalWrite(6, LOW);
    delay(n);
    digitalWrite(11, LOW);
    digitalWrite(10, LOW);
    delay(n);
  }

  // Last Sequence
  for (int i = 5; i >= 0; i--) {
    delay(500);
    digitalWrite(13, HIGH);
    digitalWrite(12, HIGH);
    digitalWrite(11, HIGH);
    digitalWrite(10, HIGH);
    digitalWrite(9, HIGH);
    digitalWrite(8, HIGH);
    digitalWrite(7, HIGH);
    digitalWrite(6, HIGH);
    digitalWrite(5, HIGH);
    digitalWrite(4, HIGH);
    delay(500);
    digitalWrite(13, LOW);
    digitalWrite(12, LOW);
    digitalWrite(11, LOW);
    digitalWrite(10, LOW);
    digitalWrite(9, LOW);
    digitalWrite(8, LOW);
    digitalWrite(7, LOW);
    digitalWrite(6, LOW);
    digitalWrite(5, LOW);
    digitalWrite(4, LOW);
  }



}