int A = 13;
int B = 12;
int C = 11;
int D = 10;
int E = 9;
int F = 8;
int G = 7;
int H = 6;
int I = 5;
int J = 4;

void setup()
{
  pinMode(13, OUTPUT);
  pinMode(12, OUTPUT);
  pinMode(11, OUTPUT);
  pinMode(10, OUTPUT);
  pinMode(9, OUTPUT);
  pinMode(8, OUTPUT);
  pinMode(7, OUTPUT);
  pinMode(6, OUTPUT);
  pinMode(5, OUTPUT);
  pinMode(4, OUTPUT);
}

void loop()
{
  digitalWrite( A, HIGH);
  delay(2000); 
  digitalWrite( B, HIGH);
  delay(2000);
  digitalWrite( C, HIGH);
  delay(2000);
  digitalWrite( D, HIGH);
  delay(2000);
  digitalWrite( E, HIGH);
  delay(2000);
  digitalWrite( F, HIGH);
  delay(2000);
  digitalWrite( G, HIGH);
  delay(2000);
  digitalWrite( H, HIGH);
  delay(2000);
  digitalWrite( I, HIGH);
  delay(2000);
  digitalWrite( J, HIGH);
  delay(2000);
  digitalWrite( A, LOW);
  digitalWrite( B, LOW);
  digitalWrite( C, LOW);
  digitalWrite( D, LOW);
  digitalWrite( E, LOW);
  digitalWrite( F, LOW);
  digitalWrite( G, LOW);
  digitalWrite( H, LOW);
  digitalWrite( I, LOW);
  digitalWrite( J, LOW);
  delay(2000);
}