9. (15 points) The figure below consists of a large square grid made up of 9 smaller $2 \times 2$ grids, with the requirement that adjacent numbers in adjacent small grids must be the same (these small grids can be rotated, but not flipped). Now, one small grid has already been placed in the large grid. Please place the remaining 8 grids according to the requirements. The number in the bottom-right cell is $\qquad$

将上面的文本翻译成英文，请保留源文本的换行和格式，直接输出翻译结果。
9. (15 points) The figure is a large square grid composed of 9 $2 \times 2$ small grids, and it is required that the adjacent numbers in adjacent small grids are exactly the same (these small grids can be rotated, but not flipped). Now, one small grid has been placed in the large grid. Please place the remaining 8 grids according to the requirements. The number in the bottom-right cell is $\qquad$ .
【Solution】Solution: According to the problem, we know:
The numbers below the known grid are 2 and 4, so we need to find a small grid with 2 and 4 on one side. Only the fourth grid meets this condition, so the right side of the fifth grid is 2 and 4. The grids that meet the condition are the fifth and seventh grids. On the right side of the known grid, we need to connect the numbers 1 and 4. Both the fifth and seventh grids meet the condition, so we find that the right side can only be the fifth and seventh grids, and whether it is the fifth or seventh grid on top or bottom, the number in the bottom-right corner is fixed as $1 \ldots$

Therefore, the answer is: 1