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digitalWrite(LED_BUILTIN, HIGH);
  delay(1000); // Wait for 1000 millisecond(s)
  digitalWrite(LED_BUILTIN, LOW);
  digitalWrite(2, HIGH);
  delay(1000);
  digitalWrite(2, LOW);
  digitalWrite(4, HIGH);
  delay(1000); // Wait for 1000 millisecond(s)
  digitalWrite(4, LOW);
  digitalWrite(7, HIGH);
  delay(1000); // Wait for 1000 millisecond(s)
  digitalWrite(7, LOW);