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"That's good news," said Bailey. "We need to make sure that inflation stays there.
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The tree starts as a single region covering the whole space. As points arrive, they get dropped into the region that contains them. When a region exceeds its capacity (the maximum number of points it can hold before splitting), the region divides into four children, and the existing points get redistributed.
Equal (5): Everything in this dark blue space must be equal to 5. The answer is 5-1, placed horizontally; 6-5, placed horizontally; 5-4, placed horizontally; 5-5, placed vertically.