// output of ./demo/bits/bitperm1-demo.cc:
// Description:
//% Certain permutations controlled by a binary word.

arg 1: 27748 == xu  [Word controlling the permutation]  default=27748
xu = 0x6c64
a=0123456789ABCDEF
x=0010011000110110
   8:    7 
   4:    3  11x
   2:    1   5x  9  13x
   1:    0   2x  4   6x  8  10x 12  14x
a=01326754CDFEAB98

