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During the 1993–1994 school year at Hogwarts School of Witchcraft and Wizardry, Professor Septima Vector assigned her third-year Arithmancy students a long essay. Hermione Granger used some complex number charts as references in making this essay.[1]

Appearances[]

Notes and references[]

  1. Harry Potter and the Prisoner of Azkaban, Chapter 12 (The Patronus)
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