// output of ./demo/gf2n/qmatrix-demo.cc:
// Description:
//% Q-matrix and nullspace of (Q-id).

arg 1: 131 == c  [Polynomial (as number)]  default=131
c=x^7 + x + 1 = 1.....11

   Q=
  1......
  ....1..
  .1..1..
  .....1.
  ..1..1.
  ......1
  ...1..1
   Q-id=
  .......
  .1..1..
  .11.1..
  ...1.1.
  ..1.11.
  .....11
  ...1...
nullspace=
  1......
