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pinMode(LED_BUILTIN, OUTPUT);

}

void loop() {

  digitalWrite(LED_BUILTIN, HIGH);   // turn the LED on (HIGH is the voltage level)
  
  delay(1000);                       // wait for a second
  
  digitalWrite(LED_BUILTIN, LOW);    // turn the LED off by making the voltage LOW


  delay(1000);                       // wait for a second
  

}