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prototypes/tile/README.md

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+# Drawing tiles on screen
+
+This directory contains a series of prototypes. For more details on the
+organization of this directory and building, see [the parent directory](..).
+
+Once you've followed the instructions for building a prototype, run most of
+them like this:
+
+```
+$ ./a.elf
+```
+
+See the code of individual prototypes for further instructions.