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diff --git a/projects/01/DMux.hdl b/projects/01/DMux.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: projects/01/DMux.hdl
+
+/**
+ * Demultiplexor:
+ * {a, b} = {in, 0} if sel == 0
+ *          {0, in} if sel == 1
+ */
+
+CHIP DMux {
+    IN in, sel;
+    OUT a, b;
+
+    PARTS:
+    Not(in=sel, out=notsel);
+    And(a=in, b=notsel, out=a);
+    And(a=in, b=sel, out=b);
+}