Subject: combine git repo historically

From: bill lam <[email-masked]>
Date: Fri, 9 Oct 2009 09:22:54 +0800

I have two git repos, no branches.

repo 1.
  emptyrootcommit -- A ... M 

repo 2.
  emptyrootcommit -- N ... Z

N was evolved from M but the time gap is large, how can I combine them
into one repo

emptyrootcommit -- A ... M -- N ... Z

so that snapshots N .. Z will not be changed.

-- 
regards,
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