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Exercise 3 
int ledPin = D2;
int ledPin2 = D3;

void setup() {
  pinMode(ledPin, OUTPUT);
  pinMode(ledPin2, OUTPUT);
}

void loop() {
  digitalWrite(ledPin, HIGH);
  digitalWrite(ledPin2, LOW);
  delay(500);

  digitalWrite(ledPin, LOW); 
  digitalWrite(ledPin2, HIGH);
  delay(500); 
  

}
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