【Answer】Solution:
$$
\begin{array}{r}
1786 \\
+\quad 230 \\
\hline 2016
\end{array}
$$

Answer: The largest four-digit number represented by the Digital Garden is 1786.
6. (10 points) In the arithmetic expression shown in the figure, different Chinese characters represent different numbers. Therefore, the largest four-digit number that the number "花园" can represent is $\qquad$ .



Translating the above text to English, while retaining the original text's line breaks and format, the result is as follows:

6. (10 points) In the arithmetic expression shown in the figure, different Chinese characters represent different numbers. Therefore, the largest four-digit number that the number "Huāyuán" can represent is $\qquad$ .