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+#ifndef PREPOSITION_H_FF908021
+#define PREPOSITION_H_FF908021
+
+namespace verbly {
+  
+  class preposition_query;
+  
+  class preposition {
+    public:
+      std::string get_form() const;
+      
+    private:
+      friend class preposition_query;
+      
+      std::string form;
+  };
+  
+  class preposition_query {
+    public:
+      preposition_query(const data& _data);
+      
+      preposition_query& limit(int _limit);
+      preposition_query& random();
+      preposition_query& in_group(std::string _arg);
+      
+      std::list<preposition> run() const;
+    
+      const static int unlimited = -1;
+    private:
+      const data& _data;
+      int _limit = unlimited;
+      bool _random = false;
+      std::list<std::string> _in_group;
+  };
+  
+};
+
+#endif /* end of include guard: PREPOSITION_H_FF908021 */