Unreferencing should put the object back onto its free list
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[단독]폴란드, 韓 해군 최초 잠수함 ‘장보고함’ 무상 양도 안받기로
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A quadtree does the same thing for two-dimensional space. It takes a rectangular region and divides it into four equal quadrants: northwest, northeast, southwest, southeast. If a quadrant has too many points in it, it subdivides again and again. Each subdivision creates smaller and smaller cells where points are densely packed.