The realization space is
  [1   1   0        1   0   1   1              0        1             1    1]
  [0   1   1   x1 - 1   0   0   1             x2   x1 - 1       -x2 + 1   x1]
  [0   0   0        0   1   1   1   -x1 - x2 + 1       x2   x1 + x2 - 1   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[x1^2 + x1*x2 - x1 + x2^2 - x2, x1^2 + x1*x2 - 2*x1 + x2^2 - x2 + 1, x1 - 1, x1*x2 + x1 + x2^2 - x2 - 1, x1 + x2 - 1, x1^2 + x1*x2 - 3*x1 + x2^2 - 2*x2 + 2, x2, x2 - 1, x1^2 + x1*x2 - x1 + x2^2, x1 + x2^2 + x2 - 1, x1 - x2, x1*x2 - 2*x2 + 1, x1, x1*x2 - x2 + 1, x1 - 2, x1 + x2 - 2, x1^2 + x1*x2 - 3*x1 + x2^2 - 3*x2 + 3, x1^2 + x1*x2 - 4*x1 + x2^2 - 3*x2 + 4, x1 + 2*x2 - 2, x1^2 + x1*x2 - 4*x1 - 3*x2 + 4, x1^2 + x1*x2 - 3*x1 - 2*x2 + 3, x1^2 + x1*x2 - 3*x1 + x2^2 - 3*x2 + 2, x1 - x2 - 1, x1 + 2*x2 - 1, x1^2 + x1*x2 - 3*x1 - 3*x2 + 2, x1^2 + x1*x2 - 2*x1 - 2*x2 + 1]