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int l2 = 8;
int i;     

void setup() {
  Serial.begin(9600);
  pinMode(l2, OUTPUT);
  }

void loop() {
  if (Serial.available() > 0) {
    i = Serial.read();
    if (i == 'c') {
      digitalWrite(l2, HIGH);
    }
    if (i == 'd') {
      digitalWrite(l2, LOW);
    }
  }
}

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