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Library/rules.h

+#ifndef RULES_H
+#define RULES_H
+
+#include <QMainWindow> // Include QMainWindow header instead of QDialog
+#include <QDialog>
+
+namespace Ui {
+class rules;
+}
+
+class rules : public QMainWindow // Derive from QMainWindow instead of QDialog
+{
+    Q_OBJECT
+
+public:
+    explicit rules(QWidget *parent = nullptr);
+    ~rules();
+
+private slots:
+    void on_Back_clicked();
+
+private:
+    Ui::rules *ui;
+};
+
+#endif // RULES_H