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diff --git a/engines/titanic/true_talk/tt_vocab.h b/engines/titanic/true_talk/tt_vocab.h
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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * 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 TITANIC_ST_VOCAB_H
+#define TITANIC_ST_VOCAB_H
+
+#include "titanic/support/string.h"
+#include "titanic/true_talk/tt_string.h"
+#include "titanic/true_talk/tt_word.h"
+
+namespace Titanic {
+
+class TTvocab {
+private:
+	TTword *_headP;
+	TTword *_tailP;
+	TTword *_word;
+	int _fieldC;
+	int _field10;
+	int _vocabMode;
+private:
+	/**
+	 * Load the vocab data
+	 */
+	int load(const CString &name);
+
+	/**
+	 * Adds a specified word to the vocab list
+	 */
+	void addWord(TTword *word);
+
+	/**
+	 * Scans the vocab list for an existing word match
+	 */
+	TTword *findWord(const TTstring &str);
+
+	/**
+	 * Scans the vocab list for a word with a synonym matching the passed string.
+	 * If found, creates a new word instance that only has the matching synonym
+	 * linked to it.
+	 * @param str		Word text to scan for
+	 * @param srcWord	Optional pointer to store the original word match was found on
+	 * @returns			A new word instance if a match if found, or null if not
+	 */
+	TTword *getPrimeWord(TTstring &str, TTword **srcWord = nullptr) const;
+
+	/**
+	 * Checks the passed word for common suffixes, like 's', 'ing', etc. and, if found,
+	 * checks for a word match for the base word without the suffix.
+	 * @param str		Word to check
+	 * @returns			New word instance for found match, or nullptr otherwise
+	 */
+	TTword *getSuffixedWord(TTstring &str) const;
+
+	/**
+	 * Checks the passed word for common prefixes, and checks for a word
+	 * match for the word without the given prefix
+	 * @param str		Word to check
+	 * @returns			New word instance for found match, or nullptr otherwise
+	 */
+	TTword *getPrefixedWord(TTstring &str) const;
+public:
+	TTvocab(int val);
+	~TTvocab();
+
+	/**
+	 * Gets a matching word from the vocab list given a passed string
+	 * @param str		Word text to scan for
+	 * @param srcWord	Optional pointer to store the original word match was found on
+	 * @returns			A new word instance if a match if found, or null if not
+	 */
+	TTword *getWord(TTstring &str, TTword **srcWord = nullptr) const;
+};
+
+} // End of namespace Titanic
+
+#endif /* TITANIC_ST_VOCAB_H */