void setup() {
  pinMode(11,OUTPUT);
  pinMode(7, OUTPUT);
  pinMode(9, OUTPUT);
}
void loop() {
  digitalWrite(11, HIGH);
  delay(500);
  digitalWrite(11, LOW);
  delay(500);
  digitalWrite(7, HIGH);
  delay(500);
  digitalWrite(7, LOW);
  delay(500);
  digitalWrite(9, HIGH);
  delay(500);
  digitalWrite(9, LOW);
  delay(500);
  

}