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Portable Network Graphic  |  1989-10-01  |  2KB  |  512x342  |  4-bit (4 colors)

Labels: text | screenshot | font | diagram | line | number | parallel
OCR: Click on the best answer 19 2 18 3 Do not exceed 8 Mg:S: electrons in valence shell 12 15 13 14 (allow 4 seconds to reset after wrong answers)

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