when to use "bk gca"?

"Robert P. J. Day" <[email protected]> Fri, 5 Nov 2004 08:39:29 -0500 (EST)
Newsgroups gmane.comp.version-control.bitkeeper.user
Message-ID <[email protected]>
  undoubtedly a silly question, but when would one use "bk gca" to
find the greatest common ancestor?  when merging two different
branches of a repo, or what?

  is there a practical example i can look at to see when i'd use that?
thanks.

rday
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