#define LED_1_PIN 18
#define LED_2_PIN 19
#define LED_3_PIN 22
#define LED_4_PIN 23

void setup() {
  pinMode(LED_1_PIN, OUTPUT);
  pinMode(LED_2_PIN, OUTPUT);
  pinMode(LED_3_PIN, OUTPUT);
  pinMode(LED_4_PIN, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  digitalWrite(LED_1_PIN, HIGH);
  delay(200); 
  digitalWrite(LED_1_PIN, LOW);
  delay(200);
  digitalWrite(LED_2_PIN, HIGH);
  delay(100); 
  digitalWrite(LED_2_PIN, LOW);
  delay(100);
  digitalWrite(LED_3_PIN, HIGH);
  delay(200);
  digitalWrite(LED_3_PIN, LOW);
  delay(200); 
  digitalWrite(LED_4_PIN, HIGH);
  delay(100); 
  digitalWrite(LED_4_PIN, LOW);
  delay(100); 
}