int R1 = 14;
int Y1 = 12;
int G1 = 13;

int R2 = 18;
int Y2 = 19;
int G2 = 21;

void setup() {

  pinMode(R1, OUTPUT);
  pinMode(Y1, OUTPUT);
  pinMode(G1, OUTPUT);

  pinMode(R2, OUTPUT);
  pinMode(Y2, OUTPUT);
  pinMode(G2, OUTPUT);

}

void loop() {

  digitalWrite(G1, HIGH);
  digitalWrite(R2, HIGH);
  delay(5000);
  digitalWrite(G1, LOW);
  digitalWrite(R2, LOW);

  digitalWrite(Y1, HIGH);
  digitalWrite(Y2, HIGH);
  delay(2000);
  digitalWrite(Y1, LOW);
  digitalWrite(Y2, LOW);

  digitalWrite(R1, HIGH);
  digitalWrite(G2, HIGH);
  delay(5000);
  digitalWrite(R1, LOW);
  digitalWrite(G2, LOW);

}