code: /* LanguageTool, a natural language style checker
   * Copyright (C) 2023 Daniel Naber (http://www.danielnaber.de)
   *
   * This library is free software; you can redistribute it and/or
   * modify it under the terms of the GNU Lesser General Public
   * License as published by the Free Software Foundation; either
   * version 2.1 of the License, or (at your option) any later version.
   *
   * This library 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
   * Lesser General Public License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this library; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301
   * USA
   */
  package org.languagetool.dev;
  
  import java.io.IOException;
  import java.nio.file.Files;
  import java.nio.file.Paths;
  import java.util.HashSet;
  import java.util.List;
  import java.util.Set;
  
  /**
   * Finds word pairs like "flexible" / "flexibel".
   */
  public class GermanElLeAdjectives {
  
    public static void main(String[] args) throws IOException {
      List<String> lines = Files.readAllLines(Paths.get(args[0]));
      Set<String> elWords = new HashSet<>();
      for (String line : lines) {
        line = line.trim();
        if (line.endsWith("el")) {
          elWords.add(line);
        }
      }
      for (String line : lines) {
        if (line.endsWith("le") && elWords.contains(line.replaceFirst("le$", "el"))) {
          System.out.println(line);
        }
      }
    }
  
  }
  