void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(13, OUTPUT);
  pinMode(37, OUTPUT);
  pinMode(14, OUTPUT);
  pinMode(36, OUTPUT);
  pinMode(15, OUTPUT);
  pinMode(35, OUTPUT);
  pinMode(1, OUTPUT);
  pinMode(2, OUTPUT);
  pinMode(21, OUTPUT);
  pinMode(20, OUTPUT);
  pinMode(19, OUTPUT);
  pinMode(4, OUTPUT);

}

void loop() {
  digitalWrite(13, HIGH);
  digitalWrite(37, HIGH);
  delay(500);
  digitalWrite(13, LOW);
  digitalWrite(37, LOW);
  delay(500);
  digitalWrite(14, HIGH);
  digitalWrite(36, HIGH);
  delay(500);
  digitalWrite(14, LOW);
  digitalWrite(36, LOW);
  delay(500);
  digitalWrite(15, HIGH);
  digitalWrite(35, HIGH);
  delay(500);
  digitalWrite(15, LOW);
  digitalWrite(35, LOW);
  delay(500);

  digitalWrite(1, HIGH);
  digitalWrite(19, HIGH);
  delay(500);
  digitalWrite(1, LOW);
  digitalWrite(19, LOW);
  delay(500);
  digitalWrite(2, HIGH);
  digitalWrite(20, HIGH);
  delay(500);
  digitalWrite(2, LOW);
  digitalWrite(20, LOW);
  delay(500);
  digitalWrite(4, HIGH);
  digitalWrite(21, HIGH);
  delay(500);
  digitalWrite(4,LOW );
  digitalWrite(21, LOW);
  delay(500);
  
}