The problem is kind of easy to understand.
Given is some points, say 10 points. (I am using numbering for understanding)
0 1 2 3 4 5 6 7 8 9
Now group these such that the group size is 5 and there is no overlap
so, there can be 2 groups. the groups are (0 1 2 3 4) & (5 6 7 8 9)
Now...