9. (12 points) Fill in the squares on the right with the ten digits $0, 1, 2, 3, 4, 5, 6, 7, 8, 9$ without repetition. Adjacent squares in the same row or column can form a two-digit number from left to right or from top to bottom (0 cannot be the first digit), then, among these two-digit numbers, the maximum number of primes is $\qquad$.
【Answer】Solution:
The prime numbers in this table are $41$, $61$, $19$, $83$, $37$, $13$, and $97$.
$1$, $3$, $5$, $7$ can only be in three positions at the end of two numbers (see the green part in the figure), so the maximum number of prime numbers is 7. Therefore, the answer is 7.