// Include required libraries
#include <Arduino.h>

// Define the pins for the LEDs
const int ledPins[] = {19, 18, 5, 17}; // Change pins as per your setup

// Define the time interval for blinking
const int blinkInterval = 300; // Blink interval in milliseconds

void setup() {
  // Set all LED pins as output
  for (int i = 0; i < 4; i++) {
    pinMode(ledPins[i], OUTPUT);
  }
}

void loop() {
  // Pattern A: * - * -
  digitalWrite(ledPins[0], HIGH);
  digitalWrite(ledPins[1], LOW);
  digitalWrite(ledPins[2], HIGH);
  digitalWrite(ledPins[3], LOW);
  delay(blinkInterval);

  // Pattern B: - * - *
  digitalWrite(ledPins[0], LOW);
  digitalWrite(ledPins[1], HIGH);
  digitalWrite(ledPins[2], LOW);
  digitalWrite(ledPins[3], HIGH);
  delay(blinkInterval);
}