// Define the LED pins
const int led1 = 8;  // LED connected to digital pin 2
const int led2 = 9;  // LED connected to digital pin 3
const int led3 = 10;  // LED connected to digital pin 4

void setup() {
  // Initialize the LED pins as outputs
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);
}

void loop() {
  // Pattern 1: LED1 ON, LED2 OFF, LED3 OFF
  digitalWrite(led1, HIGH);
  digitalWrite(led2, LOW);
  digitalWrite(led3, LOW);
  delay(1000); // Wait for 1 second
  
  // Pattern 2: LED2 ON, LED1 OFF, LED3 OFF
  digitalWrite(led1, LOW);
  digitalWrite(led2, HIGH);
  digitalWrite(led3, LOW);
  delay(1000); // Wait for 1 second
  
  // Pattern 3: LED3 ON, LED1 OFF, LED2 OFF
  digitalWrite(led1, LOW);
  digitalWrite(led2, LOW);
  digitalWrite(led3, HIGH);
  delay(1000); // Wait for 1 second
  
  // Pattern 4: LED1 ON, LED2 OFF, LED3 ON
  digitalWrite(led1, HIGH);
  digitalWrite(led2, LOW);
  digitalWrite(led3, HIGH);
  delay(1000); // Wait for 1 second
  
  // Pattern 5: LED1 OFF, LED2 ON, LED3 ON
  digitalWrite(led1, LOW);
  digitalWrite(led2, HIGH);
  digitalWrite(led3, HIGH);
  delay(1000); // Wait for 1 second
  
  // Pattern 6: LED1 ON, LED2 ON, LED3 OFF
  digitalWrite(led1, HIGH);
  digitalWrite(led2, HIGH);
  digitalWrite(led3, LOW);
  delay(1000); // Wait for 1 second
}