Lempel-Ziv-Welch data compression

The F#.NET Journal just published an article about data compression:

"LZW is a simple and effective dictionary-based data compression algorithm originally published in 1984 and subsequently used in several prominent places including the GIF image format. This article describes simple purely-functional implementations of the compression and corresponding decompression algorithms before examining the translation and optimization of these algorithms into longer but more efficient imperative equivalents. In particular, F#'s sequence expressions are used extensively to create on-the-fly compressors and decompressors ideal for stream processing...."

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