// output of ./demo/bits/gray-rec-demo.cc:
// Description:
//% Recursive algorithm for the binary Gray code.

arg 1: 5 == ldn  [Number of bits]  default=5
F  .....
B  ....1
F  ...11
B  ...1.
F  ..11.
B  ..111
F  ..1.1
B  ..1..
F  .11..
B  .11.1
F  .1111
B  .111.
F  .1.1.
B  .1.11
F  .1..1
B  .1...
F  11...
B  11..1
F  11.11
B  11.1.
F  1111.
B  11111
F  111.1
B  111..
F  1.1..
B  1.1.1
F  1.111
B  1.11.
F  1..1.
B  1..11
F  1...1
B  1....
