For implementers, the locking model adds a fair amount of non-trivial internal bookkeeping. Every operation must check lock state, readers must be tracked, and the interplay between locks, cancellation, and error states creates a matrix of edge cases that must all be handled correctly.
If you purchase the Venusaur, Charizard, and Blastoise set before March 3, you'll get the Kanto Region Badge Collection as a free gift with purchase (while supplies last). Coming in at 312 pieces and recommended for ages 18 and up, this buildable case houses all eight Pokémon Kanto region badges from the first generation of games.
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