9. (10 points) On a plane, there are 5 different lines, and these 5 lines form $m$ intersection points. How many different values can $m$ have?

保留源文本的换行和格式，翻译结果如下：

9. (10 points) On a plane, there are 5 different lines, and these 5 lines form $m$ intersection points. How many different values can $m$ have?
(4) If two lines are parallel, then \( m=5,6,7,8,9 \);

【Analysis】Discuss the value of \( m \) in different cases, such as 5 lines being parallel, 4 lines being parallel, 3 lines being parallel, 2 lines being parallel, 0 lines being parallel, 5 lines intersecting at one point, 4 lines intersecting at one point, 3 lines intersecting at one point, and find the value of \( m \) respectively.

【Solution】According to the analysis, (1) if 5 lines are parallel, the number of intersection points is 0, so \( m \) is 0;
(2) If 4 lines are parallel, the number of intersection points \( m=4 \);
(3) If 3 lines are parallel, then \( m=5,6,7 \);
(5) If no lines are parallel, then \( m=1,5,6,7,8,9,10 \).

In summary, the possible values of \( m \) are: \( 0, 1, 4, 5, 6, 7, 8, 9, 10 \), a total of 9 different values.
Therefore, the answer is: 9.