The realization space is
  [1   1   0        1   0   1   x1 - 2   1   0        1]
  [0   1   1   x1 - 1   0   0        0   1   1   x1 - 1]
  [0   0   0        0   1   1   x1 - 1   1   1       x1]
in the multivariate polynomial ring in 1 variable over ZZ
within the vanishing set of the ideal
Ideal (2*x1^3 - 8*x1^2 + 9*x1 - 2)
avoiding the zero loci of the polynomials
RingElem[2, x1, x1 - 2, x1 - 1, 2*x1 - 1, x1^2 - 3*x1 + 1, 2*x1 - 3]