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Amazon Challenges Apple With Updated Line of Kindles Inc. unveiled a new line of bigger, faster and sleeker Kindle e-readers and tablets, presenting a fresh challenge to Apple Inc.’s dominance of the market with the iPad.

The Seattle-based Web retailer introduced devices yesterday ranging in price from a $69 ad-supported e-reader to the $599 top-of-the-line Kindle Fire HD, backed by 22 million movies, TV shows, songs, apps, games, books and magazines.