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int led1 = D2;
int led2 = D3;

void setup() {
    
   pinMode (led1, OUTPUT);
   pinMode (led2, OUTPUT);
    
}

void loop() {
    
    digitalWrite(led1, HIGH);
    digitalWrite(led2, LOW);
    delay(1000);
    digitalWrite(led1, LOW);
    digitalWrite(led2, HIGH);
    delay(1000);
    
}
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