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 Environment for learning programming using mu: http://akkartik.name/post/mu
+
+Run it from the mu directory:
+
+  ```shell
+  $ ./mu edit
+  ```
+
+This will load all the `.mu` files in this directory and then run the editor.
+Press ctrl-c to quit. Press F4 to save your work (if a lesson/ directory
+exists) and to run the contents of the sandbox editor on the right.
+
+You can also run the tests for the environment:
+
+  ```shell
+  $ ./mu test edit
+  ```
+
+You can also load the files more explicitly by enumerating them all:
+
+  ```shell
+  $  ./mu edit/*.mu
+  ```
+
+This is handy if you want to run simpler versions of the editor so you can
+stage your learning.
+
+  ```shell
+  $ ./mu edit/00[12]*.mu  # run a simple editor rather than the full environment
+  ```
+
+To see how the various 'layers' are organized, peek inside the individual
+`.mu` files.