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In page Alice Liddell:

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The extent to which Dodgson's Alice may be or could be identified with Liddell is controversial. The two Alices are clearly not identical, and though it was long assumed that the fictional Alice was based very heavily on Liddell, recent research has contradicted this assumption. Dodgson himself claimed in later years that his Alice was entirely imaginary and not based upon any real child at all[citation needed].