const int  Led1 = 25;
const int  Led2 = 33;
const int  Led3 = 32;

void setup() {
  pinMode(Led1, OUTPUT);
  pinMode(Led2, OUTPUT);
  pinMode(Led3, OUTPUT);
}
void loop() {
  digitalWrite(Led1, HIGH);
  delay(1000);
  digitalWrite(Led1, LOW);

  digitalWrite(Led2, HIGH);
  delay(1000);
  digitalWrite(Led2, LOW);

  digitalWrite(Led3, HIGH);
  delay(1000);
  digitalWrite(Led3, LOW);

  digitalWrite(Led1, HIGH);
  digitalWrite(Led2, HIGH);
  delay(1000);
  digitalWrite(Led1, LOW);
  digitalWrite(Led2, LOW);

  digitalWrite(Led2, HIGH);
  digitalWrite(Led3, HIGH);
  delay(1000);
  digitalWrite(Led2, LOW);
  digitalWrite(Led3, LOW);

  digitalWrite(Led1, HIGH);
  digitalWrite(Led3, HIGH);
  delay(1000);
  digitalWrite(Led1, LOW);
  digitalWrite(Led3, LOW);

  digitalWrite(Led1, HIGH);
  digitalWrite(Led2, HIGH);
  digitalWrite(Led3, HIGH);
  delay(1000);
  digitalWrite(Led1, LOW);
  digitalWrite(Led2, LOW);
  digitalWrite(Led3, LOW); 
  delay(1000); 
}