The realization space is
  [1   0   1    1   x1 - 1   0   1    1    0   1]
  [0   1   1   x1       x1   0   0    0    1   1]
  [0   0   0    0        0   1   1   x1   -1   1]
in the multivariate polynomial ring in 1 variable over ZZ
avoiding the zero loci of the polynomials
RingElem[2, x1 - 2, x1, x1 - 1]