int redLED = 13;
int yellowLED = 12;
int greenLED =11; 
int redLED2 = 10;  
int yellowLED2 = 9;

void setup() {
pinMode(redLED, OUTPUT);
pinMode(yellowLED, OUTPUT);
pinMode(greenLED, OUTPUT);
pinMode(redLED2, OUTPUT);
pinMode(yellowLED2, OUTPUT);
}

void loop() {
digitalWrite(redLED, HIGH);
delay(100);

digitalWrite(redLED, LOW);
digitalWrite(yellowLED, HIGH);
delay(100);

digitalWrite(yellowLED, LOW);
digitalWrite(greenLED, HIGH);
delay(100);

digitalWrite(greenLED, LOW);
digitalWrite(redLED2, HIGH);
delay(100);

digitalWrite(redLED2, LOW);
digitalWrite(yellowLED2, HIGH);
delay(100);

digitalWrite(yellowLED2, LOW);
}