When Arthur Weasley takes Harry Potter and his friends to the Ministry of Magic

When Arthur Weasley takes Harry Potter and his friends to the Ministry of Magic, they need to enter a secret code on the phone. Arthur types 62442, which spells the word "magic" on a regular phone keypad. If a Muggle were to see Hogwarts, they would only see an old ruin with a sign saying "No Entry. Dangerous Building."
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