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diff --git a/src/com.example.portfolio2/com/example/portfolio2/UI.java b/src/com.example.portfolio2/com/example/portfolio2/UI.java
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+// SPDX-FileCopyrightText: 2025 Jonas Smedegaard <dr@jones.dk>
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+package com.example.portfolio2;
+
+/// Bachelorizer - reference user interface model
+public abstract class UI {
+
+	/// Default constructor
+	// (declared explicitly only to silence javadoc)
+	public UI() { }
+
+	/// structural sections of user interface
+	public enum Section {
+
+		/// main programme
+		PROGRAM("Program"),
+
+		/// first subject module
+		SUBJECT1("Subject 1"),
+
+		/// second subject module
+		SUBJECT2("Subject 2"),
+
+		/// elective courses
+		ELECTIVE("Elective");
+
+		/// text label
+		public final String label;
+
+		/// instantiation
+		///
+		/// @param label  text label
+		private Section(String label) {
+			this.label = label;
+		}
+	}
+}