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README.md

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+ex-submodule
+=============
+
+This repository contains several commits of a single project file as a simple example used in conjunction with submodules.
+
+## Usage
+
+* Adding an [example-dependency](https://github.com/githubtraining/example-dependency) with `git submodule add`
+* Examining how repositories track submodules by ref
+* Changing submodule ref with `git checkout` within the subdirectory