void setup() {
  // put your setup code here, to run once:
for(int i=5;i<13;++)
{
pinMode(i, OUTPUT);
}
}
void loop() {
  // put your main code here, to run repeatedly:
for(int j=5;j<13,j++)
  {
digitalWrite(j, HIGH);
delay(500);
  }
for(int j=5;j<13;j++)
  {
digitalWrite(j, LOW);
  }
  delay(500);
for (int j=12;j>4;j--)
{

digitalWrite((j HIGH);
delay(500);
}
for(int j=5;j<13;j++)
{
  digitalWrite(j, LOW);
  delay(500);
{}