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diff --git a/src/GudhUI/gui/Menu_edge_contraction.h b/src/GudhUI/gui/Menu_edge_contraction.h
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+++ b/src/GudhUI/gui/Menu_edge_contraction.h
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+/*    This file is part of the Gudhi Library - https://gudhi.inria.fr/ - which is released under MIT.
+ *    See file LICENSE or go to https://gudhi.inria.fr/licensing/ for full license details.
+ *    Author(s):       David Salinas
+ *
+ *    Copyright (C) 2014 Inria
+ *
+ *    Modification(s):
+ *      - YYYY/MM Author: Description of the modification
+ */
+
+#ifndef GUI_MENU_EDGE_CONTRACTION_H_
+#define GUI_MENU_EDGE_CONTRACTION_H_
+
+#include "gui/MainWindow.h"
+#include "ui_MenuEdgeContraction.h"
+
+#include "model/Model.h"
+
+class Menu_edge_contraction : public QDialog, public Ui::MenuEdgeContraction {
+  Q_OBJECT
+
+ private:
+  MainWindow* parent_;
+  const Model& model_;
+
+  void update_slider_value();
+
+ public:
+  Menu_edge_contraction(MainWindow* parent, const Model& model);
+
+  void connectActions(MainWindow* parent);
+
+ private:
+  unsigned num_vertices();
+  unsigned num_collapses();
+
+ public slots:
+  void slider_value_changed(int new_slider_value);
+  void update_gui_numbers();
+  void update_gui_numbers(int gui_numbers);
+
+  void send_contract_edges();
+
+ signals:
+  void contract_edges(unsigned num_collapses);
+};
+
+#endif  // GUI_MENU_EDGE_CONTRACTION_H_