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diff --git a/assignment-13/Arduino.icl b/assignment-13/Arduino.icl
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+implementation module Arduino
+
+import StdOverloaded
+
+import Util
+
+instance toString Button
+where
+	toString B0 = "B0"
+	toString B1 = "B1"
+	toString B2 = "B2"
+	toString B3 = "B3"
+	toString B4 = "B4"
+	toString B5 = "B5"
+
+instance print Button where print b = print (toString b)