#define r1 2
#define y1 3
#define g1 4
#define r2 5
#define y2 6
#define g2 7
#define r3 8
#define y3 9
#define g3 10
#define r4 11
#define y4 12
#define g4 13

void setup() {
  pinMode(r1, OUTPUT);
  pinMode(y1, OUTPUT);
  pinMode(g1, OUTPUT);
  pinMode(r2, OUTPUT);
  pinMode(y2, OUTPUT);
  pinMode(g2, OUTPUT);
  pinMode(r3, OUTPUT);
  pinMode(y3, OUTPUT);
  pinMode(g3, OUTPUT);
  pinMode(r4, OUTPUT);
  pinMode(y4, OUTPUT);
  pinMode(g4, OUTPUT);

  digitalWrite(r1, HIGH);
  digitalWrite(r2, HIGH);
  digitalWrite(r3, HIGH);
  digitalWrite(r4, HIGH);
  delay(2000);
}

void loop() {
  digitalWrite(r1, LOW);
  digitalWrite(y1, HIGH);
  delay(2000);
  digitalWrite(y1, LOW);
  digitalWrite(g1, HIGH);
  delay(5000);
  digitalWrite(g1, LOW);
  digitalWrite(r1, HIGH);

  digitalWrite(r2, LOW);
  digitalWrite(y2, HIGH);
  delay(2000);
  digitalWrite(y2, LOW);
  digitalWrite(g2, HIGH);
  delay(5000);
  digitalWrite(g2, LOW);
  digitalWrite(r2, HIGH);

  digitalWrite(r3, LOW);
  digitalWrite(y3, HIGH);
  delay(2000);
  digitalWrite(y3, LOW);
  digitalWrite(g3, HIGH);
  delay(5000);
  digitalWrite(g3, LOW);
  digitalWrite(r3, HIGH);

  digitalWrite(r4, LOW);
  digitalWrite(y4, HIGH);
  delay(2000);
  digitalWrite(y4, LOW);
  digitalWrite(g4, HIGH);
  delay(5000);
  digitalWrite(g4, LOW);
  digitalWrite(r4, HIGH);
}