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The Solved Seal:

The name of the next ADV card set will be "The Solved Seal". It will be released January 16th of 2004 in Japan. There will be 30 card Metagross deck for 900 yen, and 11 card booster packs that cost 300 yen.

Here are scans of some cards from ADV 4: The Solved Seal
Metagross
Registeel EX
Desert Ruins
Ancient TM (Ice)
Castform (Sun)
Exploud