// output of ./demo/bits/bitlex-rec-demo.cc:
// Description:
//% Recursive algorithm for the binary words in lexicographic order.

arg 1: 5 == ldn  [Number of bits]  default=5
arg 2: 0 == fq  [Forward (1) or backward (0) order.]  default=0
  ....1
  ...11
  ...1.
  ..1.1
  ..111
  ..11.
  ..1..
  .1..1
  .1.11
  .1.1.
  .11.1
  .1111
  .111.
  .11..
  .1...
  1...1
  1..11
  1..1.
  1.1.1
  1.111
  1.11.
  1.1..
  11..1
  11.11
  11.1.
  111.1
  11111
  1111.
  111..
  11...
  1....
  .....