how many combinations are possible in pairs in 4 sectors,
Let's use the following criterion = where one pair of 4 sectors has more numbers and the other less, A has more numbers in sector and B less, but rotating in 4 sectors, so the sector that has more can be = A, B , C, D and the sector that has the least can be A, B, C, D
it has to look like this = A, B
B.C
AD
... WHEREAS A CAN BE LARGER AND LOWER