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“Arithmancy is a magical discipline that studies the magical properties of numbers, including...Arithmancy
“Numerology and Grammatica is an Arithmancy textbook used by Third year students at Hogwarts...Numerology and Grammatica
“Numerology is a magical discipline relating to numbers that appears to be part of, similar to...Numerology
“Numerology was a book on the magical discipline of Numerology, authored by L. Wakefield. Harry...Numerology (book)
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