what kind of calculation do I use for various groups of people to meet but not repeat these people in the next groups?
like,
got a
groups 1, 2, 3 and 4
another 5, 6, 7 and 8
another 9, 10, 11 and 12
another 13, 14, 15 and 16
and another 17,18,19 and 20
then comes another meeting changing everyone's place but without repeating who has already met
a group 1, 18, 6 and 12 ... and so on.
like,
got a
groups 1, 2, 3 and 4
another 5, 6, 7 and 8
another 9, 10, 11 and 12
another 13, 14, 15 and 16
and another 17,18,19 and 20
then comes another meeting changing everyone's place but without repeating who has already met
a group 1, 18, 6 and 12 ... and so on.