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Portable Network Graphic  |  1991-11-09  |  2.4 KB  |  512x342  |  4-bit (4 colors)
   ocr: 20 Click on the best answer 19 IT 18 HH :0::0: Dor not exceed 8 electrons in 1 Mg:S: valence shell 12 15 13 (allow 4 seconds to reset after wrong answers)