docs: public static Window windowForWordInPosition(int windowSize, int wordPos, List<String> sentence) {
          List<String> window = new ArrayList<>();
          List<String> onlyTokens = new ArrayList<>();
          int contextSize = (int) Math.floor((windowSize - 1) / 2);
  
          for (int i = wordPos - contextSize; i <= wordPos + contextSize; i++) {
              if (i < 0)
                  window.add("<s>");
              else if (i >= sentence.size())
                  window.add("</s>");
              else {
                  onlyTokens.add(sentence.get(i));
                  window.add(sentence.get(i));
  
              }
          }
  
          String wholeSentence = StringUtils.join(sentence);
          String window2 = StringUtils.join(onlyTokens);
          int begin = wholeSentence.indexOf(window2);
          int end = begin + window2.length();
          return new Window(window, begin, end);
  
      }