void setup() {
  pinMode(13, OUTPUT); // red
  pinMode(11, OUTPUT); // green
  pinMode(10, OUTPUT); // blue 
}

void loop() {
  digitalWrite(13, LOW); // red ON
  digitalWrite(11, HIGH); // green OFF
  digitalWrite(10, HIGH ); // blue OFF
delay(800);
  digitalWrite(13, HIGH ); // red OFF
  digitalWrite(11, LOW); // green ON
  digitalWrite(10, HIGH); // blue OFF
  delay(800);

  digitalWrite(13, HIGH ); // red OFF
  digitalWrite(11, HIGH); // green OFF
  digitalWrite(10, LOW); // blue ON
  delay(800);

  digitalWrite(13,LOW ); // red ON
  digitalWrite(11, LOW); // green ON
  digitalWrite(10, HIGH); // blue OFF
  delay(800);

  digitalWrite(13, HIGH ); // red OFF
  digitalWrite(11, LOW); // green ON
  digitalWrite(10, LOW); // blue ON
  delay(800);

digitalWrite(13, LOW ); // red ON
  digitalWrite(11, HIGH); // green OFF
  digitalWrite(10, LOW); // blue ON
  delay(800);

  digitalWrite(13, LOW ); // red ON
  digitalWrite(11, LOW); // green ON
  digitalWrite(10, LOW); // blue ON
  delay(800);

  digitalWrite(13, HIGH ); // red OFF
  digitalWrite(11, HIGH); // green OFF
  digitalWrite(10, HIGH); // blue OFF
  delay(800);
}