int red=13;
int yellow=12;
int green=11;
int red2=10;
int yellow2=9;
int green2=8;
int red3=7;
int yellow3=6;
int green3=5;
int red4=4;
int yellow4=3;
int green4=2;
void setup() {
  // put your setup code here, to run once:
  pinMode(red , OUTPUT);
  pinMode(yellow, OUTPUT);
  pinMode(green , OUTPUT);
  pinMode(red2 , OUTPUT);
  pinMode(yellow2 , OUTPUT);
  pinMode(green2 , OUTPUT);
  pinMode(red3 , OUTPUT);
  pinMode(yellow3 , OUTPUT);
  pinMode(green3, OUTPUT);
  pinMode(red4 , OUTPUT);
  pinMode(yellow4 , OUTPUT);
  pinMode(green4 , OUTPUT);

} ;

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(red , HIGH);
  digitalWrite(yellow , LOW);
  digitalWrite(green , LOW);

  digitalWrite(red2 , HIGH);
  digitalWrite(yellow2 , LOW);
  digitalWrite(green2 , LOW);

  digitalWrite(red3 , HIGH);
  digitalWrite(yellow3 , LOW);
  digitalWrite(green3 , LOW);

  digitalWrite(red4 , LOW);
  digitalWrite(yellow4 , LOW);
  digitalWrite(green4 , HIGH);
  delay(3000);

  digitalWrite(red , LOW);
  digitalWrite(yellow , LOW);
  digitalWrite(green , HIGH);

  digitalWrite(red2 , HIGH);
  digitalWrite(yellow2 , LOW);
  digitalWrite(green2 , LOW);

  digitalWrite(red3 , HIGH);
  digitalWrite(yellow3 , LOW);
  digitalWrite(green3 , LOW);

  digitalWrite(red4 , LOW);
  digitalWrite(yellow4 , HIGH);
  digitalWrite(green4 , LOW);
  delay(3000);

    digitalWrite(red , LOW);
  digitalWrite(yellow , HIGH);
  digitalWrite(green , LOW);

  digitalWrite(red2 , HIGH);
  digitalWrite(yellow2 , LOW);
  digitalWrite(green2 , LOW);

  digitalWrite(red3 , LOW);
  digitalWrite(yellow3 , LOW);
  digitalWrite(green3 , HIGH);

  digitalWrite(red4 , HIGH);
  digitalWrite(yellow4 , LOW);
  digitalWrite(green4 , LOW);
  delay(3000);

    digitalWrite(red , HIGH);
  digitalWrite(yellow , LOW);
  digitalWrite(green , LOW);

  digitalWrite(red2 , LOW);
  digitalWrite(yellow2 , LOW);
  digitalWrite(green2 , HIGH);

  digitalWrite(red3 , LOW);
  digitalWrite(yellow3 , HIGH);
  digitalWrite(green3 , LOW);

  digitalWrite(red4 , HIGH);
  digitalWrite(yellow4 , LOW);
  digitalWrite(green4 , LOW);
  delay(3000);

   digitalWrite(red , HIGH);
  digitalWrite(yellow , LOW);
  digitalWrite(green , LOW);

  digitalWrite(red2 , LOW);
  digitalWrite(yellow2 , HIGH);
  digitalWrite(green2 , LOW);

  digitalWrite(red3 , HIGH);
  digitalWrite(yellow3 , LOW);
  digitalWrite(green3 , LOW);

  digitalWrite(red4 , HIGH);
  digitalWrite(yellow4 , LOW);
  digitalWrite(green4 , LOW);
  delay(3000);

  digitalWrite(red , HIGH);
  digitalWrite(yellow , LOW);
  digitalWrite(green , LOW);

  digitalWrite(red2 , HIGH);
  digitalWrite(yellow2 , LOW);
  digitalWrite(green2 , LOW);

  digitalWrite(red3 , HIGH);
  digitalWrite(yellow3 , LOW);
  digitalWrite(green3 , LOW);

  digitalWrite(red4 , LOW);
  digitalWrite(yellow4 , LOW);
  digitalWrite(green4 , HIGH);
  delay(3000);

}