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Graphics Interchange Format  |  1999-01-20  |  1.6 KB  |  229x256  |  4-bit (3 colors)
   ocr: - X - - - - - - X Z - - - - - - - - 13 - + - 2 12 - - - I - - - I M1 - - - - - - 3-1 pooled variance - V= ni+i - n2 -2 -