"It's too tawdry a book to comment on, " he says.

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There was no immediate comment on Pola's book from her half-siblings, Nastassja and Nikolai, when their representatives were contacted by Reuters news agency.

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The former prime minister has not yet responded to Mr Darling's claims, but on Tuesday refused to comment on other claims attributed to the book that he had a "brutal and volcanic" mood.

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Second, cyberspace turns out to have all kinds of novel spatial properties (see the new book, Cyberspace and Security: A Fundamentally New Approach, by Victor Sheymov, excerpted in this comment for more on this), but three-dimensionality is not among them.

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