Nurikabe 1: Matryoshki

Here is one Matryoshka Nurikabe puzzle. The complete grid solves as a regular 10 by 10 Nurikabe; peeling off the outer frame reveals a new 8 by 8 Nurikabe; peeling off the outer frame of that yields yet another 6 by 6 Nurikabe – and so on, all the way down to a 2 by 2 puzzle in the very center.

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