You have 18 students in a class. Each time the class meets, you want to split them into 6 groups of 3. You want to do this for seven class meetings. But you don't ever want to have any two students in the same group twice. How do you do it?

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This is what I have done so far I used numbers to represent the students

Meeting 1
1 2 3
4 5 6
7 8 9
10 11 12
13 14 15
16 17 18

Meeting 2

1 7 13
2 8 14
3 9 15
4 10 16
5 11 17
6 12 18

Meeting 3
1 12 14
2 11 15
3 13 16
4 9 17
5 8 18
6 7 10

Then I get stuck because I keep getting repeats can you show me how to solve this

Thanks