6, 3                    // Start times in order of supplied borrel lengths
1, 2                    // student 1
8, 9, 10, 11
1, 2, 3                 // student 2
8, 9, 10, 11
2, 3, 4                 // student 3
8, 9, 10
3, 4, 5                 // student 4
1, 2
1, 2                    // student 5
9, 10, 11
1, 2, 3                 // student 6
8, 9, 10, 11
6                       // total attendance