  1 = 1
  2 = 2
  3 = 3
4 = 4 = 4
5 = 5 = 5
6 but 4 = 4
7 = 7 = 7
Invisiblity test 1.: passed
Invisiblity test 2.: passed
Invisiblity test 3.: passed
--
  1 = 1
  2 = 2
  3 = 3
  4 = 4 = 4 = 4
  5
  6 == 6
  7 == 7 == 7
--
