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Graphics Interchange Format  |  1998-06-08  |  48.9 KB  |  464x293  |  4-bit (16 colors)
   ocr: SP 2R 51 P1 1 S1 P2 P2 P1 joinover PE 3 a 2 51 P2 a 91 spurious S2: P1 12 51 P1 FIGURE 3. Joinof relations SP. and PJ from Figure 2.