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In page Charlie and the Chocolate Factory:

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In the first published edition, the Oompa-Loompas were described as African pygmies, and were drawn this way in the original printed edition.[1] After the announcement of a film adaptation sparked a statement from the NAACP expressing concern that the transportation of Oompa-Loompas to Wonka's factory resembled slavery, Dahl found himself sympathizing with the NAACP's concerns and published a revised edition.[1] In this edition, as well as the subsequent sequel, the Oompa-Loompas were drawn as being white and appearing similar to hippies, and the references to Africa were deleted.[1] Dahl later expressed regret over the original version, saying that his original intention of depicting Charlie as a black child was evidence that he was not racist.[1]