. . "This letter was written by Mafalda Hopkirk to Harry Potter 31 July, 1992, warning him of his breach of the Decree for the Reasonable Restriction of Underage Sorcery. This letter was responsible for making the Dursleys aware that Harry could not perform magic outside of Hogwarts."@en . . . . . "Mafalda Hopkirk's letter to Harry Potter (1992)"@en . . "Unidentified Barn Owl"@en . . "Mafalda Hopkirk's letter to Harry Potter"@en . "Mafalda remind Harry that he is not allowed to use magic during summer and in Muggle surroundings."@en . . . . . "This letter was written by Mafalda Hopkirk to Harry Potter 31 July, 1992, warning him of his breach of the Decree for the Reasonable Restriction of Underage Sorcery. This letter was responsible for making the Dursleys aware that Harry could not perform magic outside of Hogwarts."@en . . . . "1992-07-31"^^ .