Revert, then commit, then revert again

[Samuel Sumner]

So I was working on a project in C++ that we had source controlled in
Mercurial. I eventually had made so many mistakes on the last revision,
that I wasn't getting anywhere so I reverted:

hg update -r 23

Then I made some successful changes, and committed normally.

hg commit -u .....

I still have a few minor mistakes, and in trying to solve them I realize  I
had written some code in the first tip (before the revert). Is there any
way to see the files from that revision? Or have the changes been
overwritten by the subsequent commit?

Thanks.
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