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In page Vi (text editor):
"Eventually it was observed that most ex users were spending all their time in visual mode,[citation needed] and thus in ex 2.0 (released as part of Second Berkeley Software Distribution in May, 1979), Joy created vi as a hard link to ex,[4] such that when invoked as vi, ex would automatically start up in its visual mode. Thus, vi is not the evolution of ex, vi is ex.
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