Yesterday, a few of our developers started seeing an "abort: 
00manifest.i@60300915ca73: unknown parent!" error when running `hg pull` 
(Mercurial 3.8.4 on Windows 7 x74). I tracked the problem to a specific 
changeset, stripped it from our central repository, and they were able to pull 
again.

Last week, our Mercurial server died mid-transaction. It is very large (over 
9GB with 175k changesets). The only way to recover was to re-clone the 
repository, omitting the last 9,000 commits. After the clone, I then pushed the 
"missing" 9,000 changesets from an uncorrupted clone.

All changesets pushed fine except for two. When I push them, I get "abort: 
00manifest.i@8ed639f6a6e0: no node!" and "abort: 00manifest.i@60300915ca73: no 
node!" errors.(This second one is the same missing changeset from above). Wjhen 
I tried to strip these two changesets from my repository, I get the "abort: 
00manifest.i@60300915ca73: no node!" error. I have no idea of the missing 
parent/node errors are related to the corruption and clean-up process.

>From the repository corruption page, it seems like my only option is to 
>re-clone my repository, excluding these two changesets, then pull in the 
>remaining changesets from an uncorrupted repository. Since our repository 
>takes hours to re-clone, I'm wondering if there are any other magic tricks for 
>stripping these two changesets from my repository.

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