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Author: Walter F. Tichy.
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Copyright \(co 1982, 1988, 1989 Walter F. Tichy.
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Copyright \(co 1990, 1991, 1992, 1993, 1994, 1995 by Paul Eggert.
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Walter F. Tichy,
\*r\*-A System for Version Control,
.I "Software\*-Practice & Experience"
.BR 15 ,
7 (July 1985), 637-654.
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