int red1 = 9;
int yellow1 = 8;
int green1 = 7;

int red2 = 6;
int yellow2 = 5;
int green2 = 4;

int red3 = 3;
int yellow3 = 2;
int green3 = 1;

int red4 = 12;
int yellow4 = 11;
int green4 = 10;

void setup() {


  pinMode(red1, OUTPUT);
  pinMode(yellow1, OUTPUT);
  pinMode(green1, 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() {
  // 
  digitalWrite(green1, HIGH); digitalWrite(green3, HIGH); digitalWrite(red2, HIGH); digitalWrite(red4, HIGH); 
  delay(2000);
  digitalWrite(green1, LOW); digitalWrite(green3, LOW); digitalWrite(red2, LOW); digitalWrite(red4, LOW);
  delay(1);
  
  for (int i = 0; i < 4; i++) {
    digitalWrite(yellow1, HIGH); digitalWrite(yellow3, HIGH); digitalWrite(red2, HIGH); digitalWrite(red4, HIGH);
    delay(500);
    digitalWrite(yellow1, LOW); digitalWrite(yellow3, LOW); digitalWrite(red2, HIGH); digitalWrite(red4, HIGH);
    delay(500);
  }

  digitalWrite(red2, LOW); digitalWrite(red4, LOW);
  delay(1);
  digitalWrite(red1, HIGH); digitalWrite(red3, HIGH); digitalWrite(green2, HIGH); digitalWrite(green4, HIGH);
  delay(2000);
  digitalWrite(red1, LOW); digitalWrite(red3, LOW); digitalWrite(green2, LOW); digitalWrite(green4, LOW);
  delay(1);

  for (int i = 0; i < 4; i++) {
    digitalWrite(yellow2, HIGH); digitalWrite(red3, HIGH); digitalWrite(red1, HIGH); digitalWrite(yellow4, HIGH);
    delay(500);
    digitalWrite(yellow2, LOW); digitalWrite(red3, HIGH); digitalWrite(red1, HIGH); digitalWrite(yellow4, LOW);
    delay(500);
  }

  digitalWrite(red1, LOW); digitalWrite(red3, LOW);
  delay(1);
}