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+Third-Party Code
+================
+
+Code under this folder is one of the following:
+
+1. Externally developed dependencies which have been imported ("vendored") into
+   this repository. These dependencies come with their own licenses and whatever
+   else.
+
+2. Code that is developed inside of this repository, but released to an external
+   repository via [Copybara][].
+
+[Copybara]: https://github.com/google/copybara