The realization space is
  [1   0   1   x1 - 1   0   1    0    x1 - 2   x1^2 - 3*x1 + 2         x1 - 1         x1 - 1]
  [0   1   1       x1   0   0    1    x1 - 2       x1^2 - 2*x1   -x1^2 + 2*x1   -x1^2 + 2*x1]
  [0   0   0        0   1   1   -1   -x1 + 1           -x1 + 1         x1 - 1      x1^2 - x1]
in the multivariate polynomial ring in 1 variable over ZZ
within the vanishing set of the ideal
Ideal (x1^8 - 8*x1^7 + 25*x1^6 - 39*x1^5 + 33*x1^4 - 17*x1^3 + 7*x1^2 - 2*x1)
avoiding the zero loci of the polynomials
RingElem[x1, x1 - 2, x1 - 1, x1^2 - x1 - 1, x1^2 - 3*x1 + 1, 2*x1 - 3, x1^3 - 2*x1^2 + 2*x1 - 2, x1^3 - 5*x1^2 + 6*x1 - 1, x1^2 - 2]