The realization space is
  [1   0   1        2*x1 - 1   1   0          x1 - 1   1         1           0    1]
  [0   1   1   x1^2 + x1 - 1   0   0               0   1        x1   x1^2 - x1   x1]
  [0   0   0               0   1   1   x1^2 + x1 - 1   1   -x1 + 1   -2*x1 + 1   x1]
in the multivariate polynomial ring in 1 variable over ZZ
within the vanishing set of the ideal
Ideal (8*x1^5 - 28*x1^4 + 38*x1^3 - 25*x1^2 + 8*x1 - 1)
avoiding the zero loci of the polynomials
RingElem[x1^2 + x1 - 1, x1, 2*x1 - 1, x1^2 + 2*x1 - 1, x1 - 1, x1^3 + 2*x1^2 - 3*x1 + 1, x1^2 - 4*x1 + 2, x1^2 - 3*x1 + 1]