Given an Array of unique integers of N size and a whole positive number M. M <= N. Return all possible unique selections of M items from the array.

Example: Array = [1, 2, 3, 4, 5], M = 4 -->
[
  '1, 2, 3, 4',
  '1, 2, 3, 5',
  '1, 2, 4, 5',
  '1, 3, 4, 5',
  '2, 3, 4, 5'
]

Test set 1

Result:

Test set 2

Result:

Test set 3

Result:

Test set 4

Result:

Test set 5

Result:

Test set 6

Result:

Test set 7

Result: