#define RED 1
#define YELLOW 5
#define GREEN 9

void setup( https://dumpsarena.co/salesforce-dumps/mcc-201/

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  pinMode(RED, OUTPUT);
  pinMode(YELLOW, OUTPUT);
  pinMode(GREEN, OUTPUT);
}

void loop() {
  digitalWrite(GREEN, HIGH);
  delay(3000);

  digitalWrite(GREEN, LOW);
  digitalWrite(YELLOW, HIGH);
  delay(500);

  digitalWrite(YELLOW, LOW);
  digitalWrite(RED, HIGH);
  delay(2000);

  digitalWrite(YELLOW, HIGH);
  delay(500);
  digitalWrite(YELLOW, LOW);
  digitalWrite(RED, LOW);
}