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  1. int led = 13;
  2.  
  3. void setup() {                
  4.     pinMode(led, OUTPUT);    
  5. }
  6.  
  7. void loop() {
  8.   digitalWrite(led, HIGH);  
  9.   delay(1000);              
  10.   digitalWrite(led, LOW);    
  11.   delay(1000);              
  12.   }