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Kindle upgrade v3.0 :
Has a transparent "page" that the reader can turn as they read.
Allows handwritten notes in the margins.
Retains notes for future reference.
Allows pages to be folded, torn, or crumpled by 3-yr olds of the family
Kindle upgrade v4.0 :
Charges the reader's bank account late fees if it is borrowed by a friend.
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