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Tagged Image File Format  |  1991-11-29  |  24.2 KB  |  1536x975  |  1-bit (1 colors)
   ocr: Open Open Open Open system A system B system C system S Highest layer (N+ 1)-layer (N)-layer (N-1 1)-layer Lowest layer Physical media for OSI COTT-44180 FIGURE 3/X.200 Layering in co-operating open systems