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and Mike Lesk's program. also originated on Unix and, like , produced line-by-line changes and even used angle-brackets (">" and "<") to indicate line insertions and deletions in the program's output. The heuristics used in these early applications were, however, deemed unreliable. The potential usefulness of a diff tool led McIlroy to research and design a more robust tool for a variety of tasks that could perform well under the processing and size limitations of the

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