#define LED1  2
#define LED2  4
#define LED3  5
#define LED4  18





void setup() {
  pinMode(LED1 , OUTPUT);
  pinMode(LED2 , OUTPUT);
  pinMode(LED3 , OUTPUT);
  pinMode(LED4 , OUTPUT);




}

void loop() {
  digitalWrite(LED1 , LOW);
  digitalWrite(LED2 , LOW);
  digitalWrite(LED3 , HIGH);
  digitalWrite(LED4 , HIGH);
  delay(500);

  digitalWrite(LED1 , HIGH);
  digitalWrite (LED2 , HIGH);
  digitalWrite(LED3 , LOW);
  digitalWrite(LED4 , LOW);
  delay(500);



}