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Graphics Interchange Format  |  1997-01-13  |  27KB  |  247x444  |  4-bit (16 colors)
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OCR: Screen 1 4 C 3 A B A 1 (empty) R 2 (empty) C 3 (emply) 4 (solid) Figure 4: Quake's beam tree effectively partitioned the screen into 2-D regions.