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