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@@ -57,3 +57,4 @@ The Simple language will be styled after a subset of C or Java
 * [Chapter 17](chapter17/README.md): Mutability & Syntax Sugar: `var`, `val`, `x+=y`, `for(init;test;next)body`
 * [Chapter 18](chapter18/README.md): Functions and calls.
 * [Chapter 19](chapter19/README.md): Instruction selection and portable compilation
+* [Chapter 20](chapter20/README.md): Graph Coloring Register Allocation