//Red LEDs
int red1 = 11;
int red2 = 7;
int red3 = 3;

//Yellow LEDs
int yellow1 = 10;
int yellow2 = 6;
int yellow3 = 2;

//Green LEDs
int green1 = 9;
int green2 = 5;
int green3 = 1;

void setup() {
  // put your setup code here, to run once:

  //Red LEDs
  pinMode(red1, OUTPUT);
  pinMode(red2, OUTPUT);
  pinMode(red3, OUTPUT);

  //Yellow LEDs
  pinMode(yellow1, OUTPUT);
  pinMode(yellow2, OUTPUT);
  pinMode(yellow3, OUTPUT);

  //Green LEDs
  pinMode(green1, OUTPUT);
  pinMode(green2, OUTPUT);
  pinMode(green3, OUTPUT);

}

void loop() {
  // put your main code here, to run repeatedly:

  digitalWrite(red1, HIGH);
  digitalWrite(red2, HIGH);
  digitalWrite(red3, HIGH);
  delay(2000);

  fun1();
  fun2();
  fun3();

}

void fun1() {

  digitalWrite(red1, LOW);

  digitalWrite(yellow1, HIGH);
  delay(2000);
  digitalWrite(yellow1, LOW);

  digitalWrite(green1, HIGH);
  delay(4000);
  digitalWrite(green1, LOW);

  digitalWrite(yellow1, HIGH);
  delay(2000);
  digitalWrite(yellow1, LOW);

  digitalWrite(red1, HIGH);
  delay(1000);

}

void fun2() {

  digitalWrite(red2, LOW);

  digitalWrite(yellow2, HIGH);
  delay(2000);
  digitalWrite(yellow2, LOW);

  digitalWrite(green2, HIGH);
  delay(4000);
  digitalWrite(green2, LOW);

  digitalWrite(yellow2, HIGH);
  delay(2000);
  digitalWrite(yellow2, LOW);

  digitalWrite(red2, HIGH);
  delay(1000);

}

void fun3() {

  digitalWrite(red3, LOW);

  digitalWrite(yellow3, HIGH);
  delay(2000);
  digitalWrite(yellow3, LOW);

  digitalWrite(green3, HIGH);
  delay(4000);
  digitalWrite(green3, LOW);

  digitalWrite(yellow3, HIGH);
  delay(2000);
  digitalWrite(yellow3, LOW);

}