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GIF became popular because it used Lempel–Ziv–Welch data compression. Since this was more efficient than the run-length encoding used by PCX and MacPaint, fairly large images could be downloaded reasonably quickly even with slow modems. The original version of GIF was called 87a. [1] This version already supported multiple images in a stream.
This page contains a dump analysis for errors #504 (Reference in title).. It can be generated using WPCleaner by any user. It's possible to update this page by following the procedure below: