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The Holon Research Tower Water Quarter Deck (Japanese: ホロンの研究塔ハーフデッキ1/2水EXHolon Research Tower Half Deck 1/2 Water EX) is a Japanese-exclusive Quarter Deck (see Half Deck) that complements the Holon Research Tower expansion of the Pokémon Trading Card Game.
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The majority of these cards could not be found in the main expansion. Those that were not were added to the main set when the English version was made.