// output of ./demo/seq/A191755-demo.cc:
// Description:
//% OEIS sequence A191755:
//% Binary self-shuffle words.

arg 1: 3 == n  [Length 2*n words:  n>0]  default=3
Shuffle-words:
  ......  yes
  ....11  yes
  ...1.1  yes
  ...11.  NO
  ..1..1  yes
  ..1.1.  yes
  ..11..  yes
  ..1111  yes
  .1...1  NO
  .1..1.  yes
  .1.1..  yes
  .1.111  yes
  .11...  NO
  .11.11  yes
  .111.1  NO
  .1111.  NO
  1....1  NO
  1...1.  NO
  1..1..  yes
  1..111  NO
  1.1...  yes
  1.1.11  yes
  1.11.1  yes
  1.111.  NO
  11....  yes
  11..11  yes
  11.1.1  yes
  11.11.  yes
  111..1  NO
  111.1.  yes
  1111..  yes
  111111  yes
 ct=22