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diff --git a/fuzzylite/src/hedge/Extremely.cpp b/fuzzylite/src/hedge/Extremely.cpp
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+/*
+ fuzzylite (R), a fuzzy logic control library in C++.
+ Copyright (C) 2010-2017 FuzzyLite Limited. All rights reserved.
+ Author: Juan Rada-Vilela, Ph.D. <jcrada@fuzzylite.com>
+
+ This file is part of fuzzylite.
+
+ fuzzylite is free software: you can redistribute it and/or modify it under
+ the terms of the FuzzyLite License included with the software.
+
+ You should have received a copy of the FuzzyLite License along with
+ fuzzylite. If not, see <http://www.fuzzylite.com/license/>.
+
+ fuzzylite is a registered trademark of FuzzyLite Limited.
+ */
+
+#include "fl/hedge/Extremely.h"
+
+#include "fl/Operation.h"
+
+namespace fl {
+
+    std::string Extremely::name() const {
+        return "extremely";
+    }
+
+    Complexity Extremely::complexity() const {
+        return Complexity().comparison(1).arithmetic(5);
+    }
+
+    scalar Extremely::hedge(scalar x) const {
+        return Op::isLE(x, 0.5)
+                ? 2.0 * x * x
+                : (1.0 - 2.0 * (1.0 - x) * (1.0 - x));
+    }
+
+    Extremely* Extremely::clone() const {
+        return new Extremely(*this);
+    }
+
+    Hedge* Extremely::constructor() {
+        return new Extremely;
+    }
+
+}
+