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