// output of ./demo/comb/zzztest-demo.cc:
// Description:
//% Test, ignore.

arg 1: 4 == n  [Length of things]  default=4
   0:    [ 0 1 2 3 ]    {0, 1, 2, 3}
   1:    [ 0 1 3 2 ]    {0, 1, 3} {2}
   2:    [ 0 2 1 3 ]    {0, 2} {1, 3}
   3:    [ 0 2 3 1 ]    {0, 2, 3} {1}
   4:    [ 0 3 1 2 ]    {0, 3} {1, 2}
   5:    [ 0 3 2 1 ]    {0, 3} {2} {1}
   6:    [ 1 0 2 3 ]    {1} {0, 2, 3}
   7:    [ 1 0 3 2 ]    {1} {0, 3} {2}
   8:    [ 1 2 0 3 ]    {1, 2} {0, 3}
   9:    [ 1 2 3 0 ]    {1, 2, 3} {0}
  10:    [ 1 3 0 2 ]    {1, 3} {0, 2}
  11:    [ 1 3 2 0 ]    {1, 3} {2} {0}
  12:    [ 2 0 1 3 ]    {2} {0, 1, 3}
  13:    [ 2 0 3 1 ]    {2} {0, 3} {1}
  14:    [ 2 1 0 3 ]    {2} {1} {0, 3}
  15:    [ 2 1 3 0 ]    {2} {1, 3} {0}
  16:    [ 2 3 0 1 ]    {2, 3} {0, 1}
  17:    [ 2 3 1 0 ]    {2, 3} {1} {0}
  18:    [ 3 0 1 2 ]    {3} {0, 1, 2}
  19:    [ 3 0 2 1 ]    {3} {0, 2} {1}
  20:    [ 3 1 0 2 ]    {3} {1} {0, 2}
  21:    [ 3 1 2 0 ]    {3} {1, 2} {0}
  22:    [ 3 2 0 1 ]    {3} {2} {0, 1}
  23:    [ 3 2 1 0 ]    {3} {2} {1} {0}
ct=24
