// output of ./demo/perm/permfunc-demo.cc:
// Description:
//% Demo of apply_permutation(func, ...).

arg 1: 16 == n  [size of sequence (a power of 2)]  default=16
  0:  0   0
  1:  1   1
  2:  3   3
  3:  2   2
  4:  7   7
  5:  6   6
  6:  4   4
  7:  5   5
  8: 15  15
  9: 14  14
 10: 12  12
 11: 13  13
 12:  8   8
 13:  9   9
 14: 11  11
 15: 10  10