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Here's a simple example on a repository with three branches, where we'll be adding images-annex as a subtree into master.

    $ git branch
        git-annex
        images-annex
      * master
    $ git subtree add --squash --prefix=images/ images-annex
      Added dir 'images'
    $ ls
      FILE_A        FILE_B        images/

...checkout images-annex, make changes, commit...

    $ git checkout master
    $ git subtree pull --squash --prefix=images/ . images-annex
      From .
      * branch images-annex -> FETCH_HEAD
      Merge made by the 'recursive' strategy.
      ...(files created/modified/etc)

I have tried a few different methods for merging the subtree in and so far have not been able to keep git-annex links up to date. Running `git-annex fix .` does what it's supposed to but then git sees everything as modified. Is this entirely the expected behavior because of the --prefix? I have not used subtrees much before but the model appears to be very helpful for what I'm trying to do.