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ID51-Placement of a Called Tile
Question: Where do you put a tile after you’ve called it?
Answer: Once a player has picked up a called tile, the tile must be put on the top (flat part) of their rack. This is a new ruling and the penalty for not putting the tile on the top of the rack is currently undetermined.
Source: MJME 2024, page 15, paragraph 2 & 31, paragraph, 2