int redLED = 9;    
int greenLED = 10;  
int blueLED = 11;
int purpleLED = 12;
int yellowLED = 13;

void setup() {
  pinMode(redLED, OUTPUT);
  pinMode(greenLED, OUTPUT);
  pinMode(blueLED, OUTPUT);
}

void loop() {
  // Blink the red LED
  digitalWrite(redLED, HIGH);
  delay(3000); 
  digitalWrite(redLED, LOW);
  delay(1000);  

  digitalWrite(greenLED, HIGH);
  delay(3000); 
  digitalWrite(greenLED, LOW);
  delay(1000);  

  // Blink the blue LED
  digitalWrite(blueLED, HIGH);
  delay(3000);  
  digitalWrite(blueLED, LOW);
  delay(1000);

  digitalWrite(purpleLED, HIGH);
  delay(3000);  
  digitalWrite(purpleLED, LOW);
  delay(1000);

   digitalWrite(yellowLED, HIGH);
  delay(3000);  
  digitalWrite(purpleLED, LOW);
  delay(1000); 
}