The realization space is
  [1   1   0                             x1   0   1   1         0                             x1         1      x1]
  [0   1   1   -x1^2*x2 + x1^2 - x1*x2 + x2   0   0   1        x2   -x1^2*x2 + x1^2 - x1*x2 + x2   -x2 + 1      x2]
  [0   0   0                              0   1   1   1   -x2 + 1                           x1^2        x2   x1*x2]
in the multivariate polynomial ring in 2 variables over ZZ
within the vanishing set of the ideal
Ideal (x1^2*x2^2 - 2*x1^2*x2 + x1^2 + x1*x2^2 - x2^2)
avoiding the zero loci of the polynomials
RingElem[x2, x1*x2 - x1 + x2, x2 - 1, x1 - x2, x1^2*x2 - x1^2 + x1*x2 + x1 - x2, x1^2*x2^2 - x1^2*x2 - x1^2 + x1*x2^2 + 2*x1*x2 - x2^2, x1, x1^2*x2 - 2*x1^2 + x1*x2 + x1 - x2, x1*x2^2 - 3*x1*x2 + x1 + 2*x2^2 - x2, x1*x2 + x2 - 1, x1*x2^2 - x1*x2 + x1 + x2^2 - x2, x1*x2^2 - 2*x1*x2 + x1 + 2*x2^2 - x2, x1 + 1, x1 - 1, x1^2*x2^2 - 2*x1^2*x2 + x1^2 + x1*x2^2 - x1*x2 - x2^2, x1^2*x2 - x1^2 + x1*x2 - x2, x1^2*x2^2 - 3*x1^2*x2 + x1^2 + x1*x2^2 + x1*x2 - x1 - x2^2 + x2, 2*x2 - 1, x1^2*x2^2 - 2*x1^2*x2 + x1^2 + x1*x2^2 + x1*x2 - x1 - x2^2 + x2, x1^2*x2^2 - 3*x1^2*x2 + x1^2 + x1*x2^2 - x1*x2 - x2^2 + x2, x1^2*x2^2 - 3*x1^2*x2 + x1^2 + x1*x2^2 - x1 - x2^2 + x2, x1^2*x2^2 - 3*x1^2*x2 + x1^2 + x1*x2^2 - x2^2 + x2, x1^2 + x1 - 1, x1^2*x2^2 - 2*x1^2*x2 + x1^2 + x1*x2^2 - x2^2 + x2]