I wonder what the lore is behind this weird copyright year listing on *BSD's boot sequence

Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
        The Regents of the University of California. All rights reserved.

Like I am sure there is a "good" reason why this isnt just

Copyright (c) 1979 - 1994
        The Regents of the University of California. All rights reserved.

@benjojo Probably because that list of years is not continuous. 1979 - 1944 would also include 1981, 1982, 1984, 1985, 1987, and 1990.

@benjojo I wonder if it has something to do with the presence of AT&T code at various times?

@tmcfarlane yeah must be, the whole BSD tree has bizarre copyright stuff attached to it