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Step through the construction below. Each time a new point is inserted, watch the tree decide whether it needs to split a region:
，更多细节参见雷电模拟器官方版本下载
if __name__ == "__main__":
Descending into the windowless basement of a second world war air-raid bunker built for civilians in central Berlin is arguably an eerie enough evocation of what it means to endure life in a conflict.