The realization space is
  [1   1   0         1   0   1   1    0                 1                              1                         1]
  [0   1   1   -x2 + 1   0   0   1    1           -x2 + 1   -x1*x2^2 + 2*x1*x2 - x1 + x2   -x1*x2^2 + 2*x1*x2 - x1]
  [0   0   0         0   1   1   1   x1   -x1*x2 + x1 + 1                             x2                        x2]
in the multivariate polynomial ring in 2 variables over ZZ
within the vanishing set of the ideal
Ideal with 2 generators
avoiding the zero loci of the polynomials
RingElem[x2, x2 - 1, x1, x1 + 1, x1^2*x2^2 - 2*x1^2*x2 + x1^2 - x1*x2 + 2*x1 + x2 + 1, x1*x2 - x1 - 1, x1^2*x2 - x1^2 + 1, x1^2*x2^2 - 2*x1^2*x2 + x1^2 + x1 + x2, x1^2*x2^2 - 2*x1^2*x2 + x1^2 + x2, x1^2*x2^2 - 2*x1^2*x2 + x1^2 + x1 + x2 - 1, x1*x2^2 - 2*x1*x2 + x1 + x2, x1*x2^2 - 2*x1*x2 + x1 + 1, x1*x2^2 - 2*x1*x2 + x1 + x2^2 - x2 + 1, x1^2*x2^3 - 3*x1^2*x2^2 + 3*x1^2*x2 - x1^2 - 2*x1*x2^2 + 3*x1*x2 - x1 + x2^2, x1^2*x2^3 - 3*x1^2*x2^2 + 3*x1^2*x2 - x1^2 - 2*x1*x2^2 + 4*x1*x2 - 2*x1 + x2^2 + x2 - 1, x1*x2^2 - 2*x1*x2 + x1 - 2*x2 + 1, x1^2*x2^2 - 2*x1^2*x2 + x1^2 - x1*x2 + x2 - 1, x1^2*x2^2 - 2*x1^2*x2 + x1^2 - x1*x2 + x2, x1^2*x2^2 - 2*x1^2*x2 + x1^2 - 2*x1*x2 + x1 + x2, x1^2*x2 - x1^2 - x1 + 1, x1*x2^2 - 2*x1*x2 + x1 - x2, x1*x2^2 - 2*x1*x2 + x1 + x2^2 - 3*x2 + 1, x1*x2 - x1 - x2, x1 - 1, x1*x2 - 1]