void setup() {
  pinMode(13, OUTPUT); //Red LED
  pinMode(12, OUTPUT); //Yellow LED
  pinMode(11, OUTPUT); //Blue LED
  Serial.begin(9600);
}
void loop() {
  digitalWrite(13, HIGH);
  Serial.print("Red LED is ON \n ");
digitalWrite(12, LOW);
Serial.print("Yellow LED is off \n");
digitalWrite(11,LOW);// set the LED on
Serial.print("Blue LED is off \n");
  delay(4000);

 digitalWrite(12, HIGH);
 Serial.print("Yelow LED is ON \n ");
           digitalWrite(13, LOW);
        Serial.print("Red LED is Off \n ");
           digitalWrite(11,LOW);
           Serial.print("Blue LED is Off \n ");
  delay(4000);

digitalWrite(11, HIGH);
Serial.print("Blue LED is ON \n ");
           digitalWrite(12, LOW);
       Serial.print("Yellow LED is Off \n ");
           digitalWrite(13,LOW);
           Serial.print("Red LED is Off \n ");
            Serial.print("Starting Right to Left Sequence \n");
  delay(4000);

 digitalWrite(12, HIGH);   //
 Serial.print("Yellow LED is ON \n ");
           digitalWrite(13, LOW);
        Serial.print("Red LED is Off \n ");
           digitalWrite(11,LOW);
           Serial.print("Blue LED is Off \n ");
  delay(4000);
}