int timedelay=100;
void setup()
{
  for(int i=4;i<=13;i++)
  pinMode(i, OUTPUT);
}
void loop()
{
  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=12;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);
  }
}