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From: Doug McIlroy <doug@cs.dartmouth.edu>
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Subject: Re: [TUHS] Deleted lib1 and lib2 in v6, recoverable?
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> But wasn't it tsort that did the heavy lifting to get things in order?

An amusing notion. Having written tsort, I can assure you it couldn't
lift anything heavy--it used the most naive quadratic algorithm. But
it was good enough for libc.

Doug