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diff --git a/chips/Mux4Way16.hdl b/chips/Mux4Way16.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/Mux4Way16.hdl
+
+/**
+ * 4-way 16-bit multiplexor:
+ * out = a if sel == 00
+ *       b if sel == 01
+ *       c if sel == 10
+ *       d if sel == 11
+ */
+
+CHIP Mux4Way16 {
+    IN a[16], b[16], c[16], d[16], sel[2];
+    OUT out[16];
+
+    PARTS:
+    // Put your code here:
+    Mux16 (a=a, b=b, sel=sel[0], out=out1);
+    Mux16 (a=c, b=d, sel=sel[0], out=out2);
+    Mux16 (a=out1, b=out2, sel=sel[1], out=out);
+}