@Override
  public @NotNull List<GenerationNode> expand(int numberInIteration,
                                              int totalIterations, String surroundedText,
                                              CustomTemplateCallback callback,
                                              boolean insertSurroundedTextAtTheEnd, GenerationNode parent) {
    if (myLeftOperand instanceof MulOperationNode || (myLeftOperand instanceof UnaryMulOperationNode && surroundedText != null)) {
      List<GenerationNode> result = new ArrayList<>();
      if (myLeftOperand instanceof MulOperationNode mul) {
        for (int i = 0; i < mul.getRightOperand(); i++) {
          List<GenerationNode> parentNodes = mul.getLeftOperand().expand(i, totalIterations, surroundedText, callback, insertSurroundedTextAtTheEnd,
                                                                         parent);
          for (GenerationNode parentNode : parentNodes) {
            myRightOperand.expand(i, totalIterations, surroundedText, callback, insertSurroundedTextAtTheEnd, parentNode);
          }
          result.addAll(parentNodes);
        }
      }
      else {
        UnaryMulOperationNode unaryMul = (UnaryMulOperationNode)myLeftOperand;
        String[] lines = LineTokenizer.tokenize(StringUtil.trim(surroundedText), false);
        for (int i = 0; i < lines.length; i++) {
          String line = lines[i].trim();
          List<GenerationNode> parentNodes =
            unaryMul.getOperand().expand(i, totalIterations, line, callback, insertSurroundedTextAtTheEnd, parent);
          for (GenerationNode parentNode : parentNodes) {
            myRightOperand.expand(i, totalIterations, line, callback, insertSurroundedTextAtTheEnd, parentNode);
          }
          result.addAll(parentNodes);
        }
      }
      return result;
    }
    List<GenerationNode> leftGenNodes = myLeftOperand.expand(numberInIteration, totalIterations, surroundedText, callback, insertSurroundedTextAtTheEnd, parent);

    if (leftGenNodes.isEmpty()) {
      return myRightOperand.expand(numberInIteration, totalIterations, surroundedText, callback, insertSurroundedTextAtTheEnd, parent);
    }
    
    for (GenerationNode leftGenNode : leftGenNodes) {
      myRightOperand.expand(numberInIteration,totalIterations , surroundedText, callback, insertSurroundedTextAtTheEnd, leftGenNode);
    }
    return leftGenNodes;
  }
@Override
  public @NotNull List<GenerationNode> expand(int numberInIteration,
                                              int totalIterations, String surroundedText,
                                              CustomTemplateCallback callback,
                                              boolean insertSurroundedTextAtTheEnd, GenerationNode parent)