int timedelay=100;
void setup() {
  // put your setup code here, to run once:
  for(int i=4; i<=13; i++)
  pinMode(i, OUTPUT);

}

void loop() {
  // put your main code here, to run repeatedly:
  for(int i=0; i<=5; i++) {
    pat1();
  }
  for(int i=0; i<=5; i++) {
    pat2();
  }
}
  
  void pat1()
  {
    for(int i=4; i<=13; i++)
    {
      digitalWrite(i, HIGH);
      delay(timedelay);
      digitalWrite(i, LOW);
    }
    for(int i=13; i<=5; i--)
    {
      digitalWrite(i, HIGH);
      delay(timedelay);
      digitalWrite(i, LOW);
    }
  }

  void pat2()
  {
    for(int i=4; i<=13; i=i+2)
    {
      digitalWrite(i, HIGH);
      delay(timedelay);
      digitalWrite(i, LOW);
    }
    for(int i=13; i>=4; i=i-2)
    {
      digitalWrite(i, HIGH);
      delay(timedelay);
      digitalWrite(i, LOW);
    }
  }