8. (3 points) Let "学" and "习" represent two different digits. The product of the four-digit number "学学学学" and the five-digit number "羽习习习习" is a seven-digit number, and its unit and millionth place digits are the same as the digit represented by "学". How many two-digit numbers can "学习" represent? $\qquad$ 

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Translation:

8. (3 points) Let "学" and "习" represent two different digits. The product of the four-digit number "学学学学" and the five-digit number "羽习习习习" is a seven-digit number, and its unit and millionth place digits are the same as the digit represented by "学". How many two-digit numbers can "学习" represent? $\qquad$
【Analysis】Since the product of the four-digit number "学学学学" and "司习习习" is a seven-digit number, and its unit and millionth digit are the same as the digit represented by "学", then 习 $=1$. If 习 takes a number greater than 1, it does not meet the requirements. Also, $1111 \times 2222=2468642, 1111 \times 3333=3702963, 1111 \times 4444=4937284, 1111 \times 5555=6171605$, which do not meet the requirements. According to this, the problem can be solved.

【Solution】According to the analysis in the problem, we get: $1111 \times 2222=2468642$,
$1111 \times 3333=3702963$,
$1111 \times 4444=4937284$,
the unit and millionth digit of their products are the same as the digit represented by "学", so 习 $=1$,
Therefore, the two-digit number represented by "学习" can be $21, 31, 41$, a total of 3.
Answer: The two-digit number represented by "学习" has a total of 3.
So the answer is: 3.