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Flatten with Depth
Implement flatten(arr, depth) that flattens nested arrays up to a specific depth. Depth controls how many nesting levels to remove: depth = 0 returns a shallow copy; depth = 1 flattens one level. Handle mixed primitives and arrays.
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Flatten with Depth: Implement flatten(arr, depth) that flattens nested arrays up to a specific depth. Depth controls how many nesting levels to remove: depth = 0 returns…. Expect arrays and depth decisions under intermediate level constraints.
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