const int red = 13;
const int yellow = 12;
const int green = 11; 
void setup() { 
pinMode(red, OUTPUT);
pinMode(yellow,OUTPUT);
pinMode(green, OUTPUT);
}
void loop() {
digitalWrite(red, HIGH);
delay(10);
digitalWrite(red, LOW);
delay(100);

digitalWrite(yellow, HIGH);
delay(10);
digitalWrite(yellow, LOW);
delay(100);

digitalWrite(green, HIGH);
delay(10);
digitalWrite(green, LOW);
delay(100);

}