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int ledPin1 = D2;
int ledPin2 = D1;

void setup(){
    pinMode(ledPin1,OUTPUT);
    pinMode(ledPin2,OUTPUT);
    
}

void loop(){
    for (int i = 0; i < 5; i++){
        
        digitalWrite(ledPin1,HIGH);
        digitalWrite(ledPin2,LOW);
        delay(500);
    
        digitalWrite(ledPin2,HIGH);
        digitalWrite(ledPin1,LOW);
        delay(500);
    }
    digitalWrite(ledPin2,LOW);
    delay(3000);
}
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