Quadtree-based image compression formats and level-of-detail systems all work this way. Satellite imagery, terrain rendering, and geographic information systems use quadtree decomposition to serve data at varying resolutions: zoomed out, you see large coarse blocks; zoomed in, you see fine-grained tiles. The same principle extends to three dimensions (octrees) for volume rendering and 3D spatial indexing.
Number (3): Everything in this space must add up to 3. The answer is 0-2, placed vertically; 1-3, placed vertically.
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expect. Just a year or two later, a now-forgotten company called Docutel was