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int ledPinR = D2;
int ledPinB = D3;

void setup() {
    pinMode(ledPinR, OUTPUT);
    pinMode(ledPinB, OUTPUT);
}

void loop() {
    digitalWrite(ledPinR, HIGH);
    digitalWrite(ledPinB, LOW);
    delay(1000);
    
    digitalWrite(ledPinR, LOW);
    digitalWrite(ledPinB, HIGH);
    delay(1000);
}
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