Input
16	
2 	
2,3	
3 	
4,1,3,2,3,7,4,8,13,4,12,16,3 
2,1,7,4,9,16,3
4,1,5,4,3,8,3,9,12,2,10,16,5

Output 
Most optimal solution, three people attending borrel 1 (length of 2), one person attending borrel 2 (length of 3)
8, 1
1,2
3,4,5,6
10,11,12,13
14,15,16
4,5,6,7
10
1,2,3,4
5,6,7
10,11
12,13,14,15,16
4