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.
Each puzzle features 16 words and each grouping of words is split into four categories. These sets could comprise of anything from book titles, software, country names, etc. Even though multiple words will seem like they fit together, there's only one correct answer.
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Some merchants run their affiliate programs internally, while others choose to contract out management to a network or an external agency.
核出口单位违反本法规定出口核以及核两用物项的，依照有关法律、行政法规的规定承担法律责任。
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