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int led1 = D2;

void setup() {
    
pinMode( led1, OUTPUT);
}

void loop() {
    
digitalWrite(led1, HIGH);

delay(3000);

digitalWrite(led1, LOW);

delay(3000);

digitalWrite(led1, HIGH);

delay(3000);

digitalWrite(led1, LOW);

delay(3000);

digitalWrite(led1, HIGH);

delay(3000);

digitalWrite(led1, LOW);

delay(3000);

digitalWrite(led1, HIGH);

delay(3000);

digitalWrite(led1, LOW);

delay(3000);

digitalWrite(led1, HIGH);

delay(3000);

digitalWrite(led1, LOW);

delay(3000);

}
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