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diff --git a/tools/builtInChips/Mux.hdl b/tools/builtInChips/Mux.hdl
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+// This file is part of www.nand2tetris.org
+// and the book "The Elements of Computing Systems"
+// by Nisan and Schocken, MIT Press.
+// File name: tools/builtIn/Mux.hdl
+
+/** 
+ * Multiplexor. If sel == 1 then out = b else out = a.
+ */
+
+CHIP Mux {
+
+    IN  a, b, sel;
+    OUT out;
+
+    BUILTIN Mux;
+}