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

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