the [Vesta] weeder does not have any fixed … a system administrator to determine the circumstances under … because all sources in Vesta are immutable and … much. … Experience indicates that finding a comfortable tradeoff [between deleting too much and too little], and writing the deletion instructions … are not difficult. Here is an example: // … [LAST-1,LAST] … [p. 149] The first line [saves] the two latest versions of releases … The second line keeps the last checked-in version … of the latest version of the 'vesta' package. … [p. 156] [The weeder] greatly simplifies the use and administration … files, and administrators can, with a few simple …
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