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int led1 = D2;

int led2 = D3;

void setup() {

pinMode(led1, OUTPUT);
pinMode(led2, OUTPUT);

}

void loop() {
    
  digitalWrite(led1, HIGH);
  
  delay(1000);
  
  digitalWrite(led1, LOW);

  delay(1000);


  digitalWrite(led2, HIGH);
  
  delay(1000);

 
  digitalWrite(led2, LOW);

  delay(1000);


}
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