* @return the value with the specified row and column
   * @throws IndexOutOfBoundsException if either index is negative, {@code rowIndex} is greater than
   *     or equal to the number of allowed row keys, or {@code columnIndex} is greater than or equal
   *     to the number of allowed column keys
   */
  public @Nullable V at(int rowIndex, int columnIndex) {

  })
  String implName;

  MapsImplEnum mapsImpl;

  /**
   * A map of contents pre-created before experiment starts to only measure map creation cost. The
   * implementation for the creation of contents is independent and could be different from that of
   * the map under test.
   */
  Map<Element, Element> contents;

  /** Map pre-created before experiment starts to only measure iteration cost during experiment. */

   *     {@link Integer#MAX_VALUE}
   * @throws NullPointerException if {@code lists}, any one of the {@code lists}, or any element of
   *     a provided list is null
   * @since 19.0
   */
  public static <B> List<List<B>> cartesianProduct(List<? extends List<? extends B>> lists) {
    return CartesianList.create(lists);
  }

  /**

        }
        return OptionalEntity.empty();
    }

    /**
     * Creates a synonym item from the provided form data with validation.
     *
     * @param form the create form containing synonym data
     * @param hook the validation error hook for handling errors
     * @return OptionalEntity containing the created synonym item or empty if creation failed
     */

    /**
     * Creates a new request header item.
     *
     * @param form the create form containing the new item data
     * @return HTML response redirecting to the list page after creation
     */
    @Execute
    @Secured({ ROLE })
    public HtmlResponse create(final CreateForm form) {
        verifyCrudMode(form.crudMode, CrudMode.CREATE, this::asListHtml);

            return null;
        })).status(ApiResult.Status.OK).result());
    }

    /**
     * Creates a new user setting.
     *
     * @param body the user data to create
     * @return JSON response containing the created user setting ID
     */
    // POST /api/admin/user/setting
    @Execute
    public JsonResponse<ApiResult> post$setting(final CreateBody body) {

    }

    /**
     * Creates and returns an initial context.
     *
     * @return the initial context
     */
    public static InitialContext create() {
        try {
            return new InitialContext();
        } catch (final NamingException ex) {
            throw new NamingRuntimeException(ex);
        }
    }

    /**

        // Then
        assertNotNull(resource1, "First resource should be created");
        assertNotNull(resource2, "Second resource should be created");
        assertNotNull(pipe1, "First pipe should be created");
        assertNotNull(pipe2, "Second pipe should be created");

        assertNotSame(resource1, resource2, "Different resources should be different instances");

                    return null;
                })).status(ApiResult.Status.OK).result());
    }

    /**
     * Creates a new stemmer override dictionary item.
     *
     * @param dictId the dictionary ID
     * @param body the request body containing stemmer override item information
     * @return JSON response with result status
     */

    /**
     * Creates a new duplicate host setting.
     *
     * @param body duplicate host setting data to create
     * @return JSON response with created setting ID and status
     */
    @Execute
    public JsonResponse<ApiResult> post$setting(final CreateBody body) {
        validateApi(body, messages -> {});
        body.crudMode = CrudMode.CREATE;