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https://www.spigotmc.org/resources/fast-chunk-pregenerator.74429/
It will create two worlds. 1 is empty for the game. 1 pre-generated will be used to transfer blocks from it to the first world. (admin command)
(player command)
A small game location will be generated for the Player and he will receive an infinite block to generate 1 layer (1x1). You can create games with large sizes (3x3), (5x5), (9.9)... /and give "nick" "gen_type"
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