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diff --git a/quackleio/dict.h b/quackleio/dict.h
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+/*
+ *  Quackle -- Crossword game artificial intelligence and analysis tool
+ *  Copyright (C) 2005-2006 Jason Katz-Brown and John O'Laughlin.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  
+ *  02110-1301  USA
+ */
+
+#ifndef QUACKLEIO_DICT_H
+#define QUACKLEIO_DICT_H
+
+#include <vector>
+
+#include <QStringList>
+
+#include <alphabetparameters.h>
+#include <generator.h>
+
+namespace Dict
+{
+
+class Extension : public Quackle::ExtensionWithInfo
+{
+public:
+	Extension() {}
+	Extension(const Quackle::ExtensionWithInfo extensionWithInfo);
+	QString word;
+};
+
+typedef QList<Extension> ExtensionList;
+
+class Word : public Quackle::WordWithInfo
+{
+public:
+	QString word;
+
+	static ExtensionList extensionsByLength(int length, const ExtensionList &list);
+
+	ExtensionList getFrontExtensionList() const;
+	ExtensionList getBackExtensionList() const;
+
+private:
+	ExtensionList getExtensionList(bool front) const;
+};
+
+class WordList : public QList<Word>
+{
+public:
+	WordList();
+	~WordList();
+
+	enum SortType { Alphabetical, Playability, Length, LengthLongestFirst, Probability };
+
+	void setSortBy(SortType sortType);
+	static SortType sortType;
+};
+
+typedef QList<WordList> WordListList;
+
+class Querier
+{
+public:
+	virtual ~Querier() {};
+
+	enum QueryFlags { None = 0x0000, WithExtensions = 0x0001, NoRequireAllLetters = 0x0002, CallUpdate = 0x0004 };
+
+	virtual WordList query(const QString &query, int flags = None) = 0;
+	virtual QString alphagram(const QString &letters) const = 0;
+	virtual bool isBritish(const Quackle::LetterString &word) = 0;
+	virtual bool isLoaded() const = 0;
+};
+
+}
+
+// Returns true if word1 is less playable than word2;
+// otherwise returns false.
+bool operator<(const Dict::Word &word1, const Dict::Word &word2);
+
+#endif