#define Aled 3
#define Bled 9
#define Cled 11
#define Dled 13
#define Dledv 12
#define Cledv 10
#define Bledv 8
#define Aledv 2
void setup()
{
  pinMode(Aled, OUTPUT);
  pinMode(Bled, OUTPUT);
  pinMode(Cled, OUTPUT);
  pinMode(Dled, OUTPUT);
  pinMode(Dledv, OUTPUT);
  pinMode (Cledv, OUTPUT);
  pinMode (Bledv, OUTPUT);
  pinMode (Aledv, OUTPUT);
  digitalWrite(Aled, HIGH);
  digitalWrite(Bled, HIGH);
  digitalWrite(Cled, HIGH);
  digitalWrite(Dled, HIGH);
  digitalWrite(Aledv, LOW);
  digitalWrite(Bledv, LOW);
  digitalWrite(Cledv, LOW);
  digitalWrite(Dledv, LOW);
  
}


void loop()
  
{
  
  digitalWrite(Aledv, HIGH);
  digitalWrite(Aled, LOW);
  delay(3000);
  digitalWrite(Aledv, LOW);
  digitalWrite(Aled,HIGH);
 
  
  
 
  digitalWrite(Bled, LOW);
  digitalWrite(Bledv, HIGH);
  delay(3000);
  digitalWrite(Bledv, LOW);
  digitalWrite(Bled,HIGH);
  
  
  
  
  
  
  digitalWrite(Cled, LOW);
  digitalWrite(Cledv, HIGH);
  delay(3000);
  digitalWrite(Cledv, LOW);
  digitalWrite(Cled, HIGH);
  
  
  
  
  
  digitalWrite(Dled, LOW);
  digitalWrite(Dledv, HIGH);
  delay(3000);
  digitalWrite(Dled, HIGH);
  digitalWrite(Dledv,LOW);
}