int red = 2; // use this pin to control Red LED
int blue = 3; // use this pin to control Blue LED
int green = 4; // use this pin to control Green LED

void setup() {
  pinMode(red, OUTPUT);
  pinMode(blue, OUTPUT);
  pinMode(green, OUTPUT);
}

void loop() { //MAIN PROGRAM 
  checkRed();
  checkGreen();
  checkBlue();
}


void checkRed() { // Subrountine
digitalWrite(red, HIGH);
delay(600);
digitalWrite(red, LOW);
delay(600);
}

void checkGreen() {  // Subrountine
digitalWrite(green, HIGH);
delay(500);
digitalWrite(green, LOW);
delay(500);
}

void checkBlue() {  // Subrountine
digitalWrite(blue, HIGH);
delay(400);
digitalWrite(blue, LOW);
delay(400);
}