The realization space is
  [1   1   0     x2 - 1   0   1   1         0      x1*x2 - x1      x1*x2 - x1    1]
  [1   0   1   -x1 + x2   0   1   0   x1 - x2   -x1^2 + x1*x2   -x1*x2 + x2^2   x1]
  [0   0   0          0   1   1   1       -x2   -x1*x2 + x2^2   -x1*x2 + x2^2   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, x1^2 - 3*x1*x2 + x2^2 + x2, x1 - x2, x1 - 1, 2*x1*x2 - x1 - x2^2, x1^2*x2 - x1^2 + x1*x2 - x2^2, 2*x1^2*x2 - x1^2 - 2*x1*x2^2 + x1*x2 + x2^3 - x2^2, 2*x1 - x2, 2*x1 - x2 - 1, 2*x1*x2 - x1 - x2^2 + x2, x1 + x2 - 1, x1, x2 - 1, 2*x2 - 1, 3*x1*x2 - x1 - 2*x2^2, 2*x1^2 - 2*x1*x2 - x1 + x2^2, 3*x1^2*x2 - x1^2 - 3*x1*x2^2 + x2^3, 3*x1*x2 - x1 - x2^2, x1^2 + x1*x2 - x1 - x2^2, x1 - 2*x2]