11. (12 points) Starting from the top left, the numbers appearing along the track are $1,2,3,1,2,3, \cdots$ Each row and each column contains 1 one, 1 two, and 1 three (the other two positions are left blank), so the five positions in the third row from left to right form the five-digit number $\qquad$ . (If there is no number in a position, write 0)
【Answer】Solution: According to the problem, we know:
First, analyze the empty space above the 3 in the first column, which can only be 1 and 2.
In the fifth column, only the number 2 is missing 1 and 3, so they must be filled in order. Continue reasoning accordingly; hence the answer is: 10302.