// Define the pins for the LEDs
int led1 = 2;
int led2 = 3;

void setup() {
  // Set the LED pins as outputs
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
}

void loop() {
  // Turn on the first LED
  digitalWrite(led1, HIGH);
  delay(100);  // Wait for 100 milliseconds
  
  // Turn off the first LED
  digitalWrite(led1, LOW);
  delay(100);  // Wait for 100 milliseconds
  
  // Turn on the second LED
  digitalWrite(led2, HIGH);
  delay(100);  // Wait for 100 milliseconds
  
  // Turn off the second LED
  digitalWrite(led2, LOW);
  delay(100);  // Wait for 100 milliseconds
  
  // Turn on both LEDs
  digitalWrite(led1, HIGH);
  digitalWrite(led2, HIGH);
  delay(100);  // Wait for 100 milliseconds
  
  // Turn off both LEDs
  digitalWrite(led1, LOW);
  digitalWrite(led2, LOW);
  delay(100);  // Wait for 100 milliseconds
}