7. (10 points) Fill in the blanks with numbers $1-6$, so that each snowflake and the six cells in three directions do not repeat any numbers, as shown in Figure 1 is a complete example. Please fill in the blanks in Figure 2, then the four-digit number $\overline{\mathrm{ABCD}}$ represented by the four English letters in the figure is $\qquad$

Fill in the blanks with numbers $1-6$, so that each snowflake and the six cells in three directions do not repeat any numbers, as shown in Figure 1 is a complete example. Please fill in the blanks in Figure 2, then the four-digit number $\overline{\mathrm{ABCD}}$ represented by the four English letters in the figure is $\qquad$
7. (10 points) Fill in the blanks with numbers $1-6$, so that the numbers in each snowflake and the six cells in three directions do not repeat. Figure 1 is a complete example. Please fill in the blanks in Figure 2. The four-digit number $\overline{\mathrm{ABCD}}$ represented by the four English letters in the figure is $\qquad$ 2561
【Solution】Solution: According to the problem, we know:
First, in the hexagon containing the letter $C$, the number between 2 and 3 can only be 1 or 5. Since there is a number 5 in the lower right of the hexagon containing 3, it can only be filled with the number 1. Therefore, in the cell containing the letter $A$, the number between 4 and 6 can only be 5.

Similarly, based on the position of the letter $D$, it can only be filled with the number 1, so $B$ is the number 2.
According to the cell containing the letter $A$, the number above 6 can only be 3.
Based on the position of $A$, it can only be filled with 1 or 2, excluding 1, it can only be filled with the number 2.
Continuing the reasoning, we get the following figure:
Therefore, the answer is: 2561