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diff --git a/tools/builtInChips/Or.hdl b/tools/builtInChips/Or.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/Or.hdl
+
+/**
+ * Or gate: out = 1 if {a == 1 or b == 1}, 0 otherwise  
+ */
+
+CHIP Or {
+
+    IN  a, b;
+    OUT out;
+
+    BUILTIN Or;
+}