int LED(13, 12, 11);
void setup() {
  // put your setup code here, to run once:
pinMode(13, OUTPUT);
pinMode(12, OUTPUT);
pinMode(11, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  
digitalWrite(13,HIGH); //red
delay(2000);
digitalWrite(13, LOW);
delay(100);

digitalWrite(12, HIGH); //yellow
delay(2000);
digitalWrite(12, LOW);
delay(100);

digitalWrite(11,HIGH);//green
delay(2000);
digitalWrite(12, HIGH);
delay(100);

digitalWrite(11,LOW);//green
delay(2000);
digitalWrite(12, LOW);
delay(100);
}