 stopped after 5 steps, only a few more than these 5 locations have been calculated.
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The sprawl's full memory is however allocated immediately. The amount is proportional to the size of the world map, on a 100% size map it's about 50k
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An iteration step in a sprawl is an O(log n) operation, where n is its size.
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Alternatively to using foreach, you can iterate a sprawl with its enumerator, which allows to iterate multiple sprawls at once.
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A sprawl does not support ne