+#include "built-in-led.h"
+#include <Arduino.h>
 #include <EEPROM.h>
+#include <MFRC522.h>
 #include <SPI.h>
-#include <MFRC522.h>
 
 constexpr uint8_t relay = 12;
 

    }

    EEPROM.write(1, 143);

    Serial.println(F("Succesfully defined the master card."));
    Serial.println("");
  }

  for (uint8_t i = 0; i < 4; i++) {
    masterCard[i] = EEPROM.read(2 + i);
  }

  Serial.println(F("Ready to bounce!"));
  Serial.println("");
}

void loop() {

  for (uint8_t k = 0; k < 4; k++) {
    EEPROM.write(start + j + k, 0);
  }
}

boolean checkTwo(byte a[], byte b[]) {
