The realization space is
  [1   0   1          1   0   1    0    1          1    1          x2]
  [0   1   1   2*x2 + 1   0   0    1    1   2*x2 + 1   x2   -2*x2 - 1]
  [0   0   0          0   1   1   -1   x1        -x2    1    2*x2 + 1]
in the multivariate polynomial ring in 2 variables over ZZ
avoiding the zero loci of the polynomials
RingElem[2*x2 + 1, x2 + 1, 2, x2, x1*x2 + x1 - 2*x2, 2*x1*x2 + x1 - x2, x1 + 1, x1*x2 - 2*x2 - 1, 3*x2 + 1, x1, x1 - x2, x1*x2 - 1, x1 - 1, x2 - 1, 2*x1*x2 + x1 + x2, x1 + x2, x1 - 2*x2, 2*x1*x2 + x1 - 2*x2]