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diff --git a/intl/icu/source/i18n/tolowtrn.h b/intl/icu/source/i18n/tolowtrn.h
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+// © 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+/*
+**********************************************************************
+*   Copyright (C) 2001-2007, International Business Machines
+*   Corporation and others.  All Rights Reserved.
+**********************************************************************
+*   Date        Name        Description
+*   05/24/01    aliu        Creation.
+**********************************************************************
+*/
+#ifndef TOLOWTRN_H
+#define TOLOWTRN_H
+
+#include "unicode/utypes.h"
+
+#if !UCONFIG_NO_TRANSLITERATION
+
+#include "unicode/translit.h"
+#include "casetrn.h"
+
+U_NAMESPACE_BEGIN
+
+/**
+ * A transliterator that performs locale-sensitive toLower()
+ * case mapping.
+ * @author Alan Liu
+ */
+class LowercaseTransliterator : public CaseMapTransliterator {
+
+ public:
+
+    /**
+     * Constructs a transliterator.
+     * @param loc the given locale.
+     */
+    LowercaseTransliterator();
+
+    /**
+     * Destructor.
+     */
+    virtual ~LowercaseTransliterator();
+
+    /**
+     * Copy constructor.
+     */
+    LowercaseTransliterator(const LowercaseTransliterator&);
+
+    /**
+     * Transliterator API.
+     * @return a copy of the object.
+     */
+    virtual LowercaseTransliterator* clone() const;
+
+    /**
+     * ICU "poor man's RTTI", returns a UClassID for the actual class.
+     */
+    virtual UClassID getDynamicClassID() const;
+
+    /**
+     * ICU "poor man's RTTI", returns a UClassID for this class.
+     */
+    U_I18N_API static UClassID U_EXPORT2 getStaticClassID();
+private:
+
+    /**
+     * Assignment operator.
+     */
+    LowercaseTransliterator& operator=(const LowercaseTransliterator&);
+};
+
+U_NAMESPACE_END
+
+#endif /* #if !UCONFIG_NO_TRANSLITERATION */
+
+#endif