The realization space is
  [1   0   1   2*x1 - 1   0   1    0   x1^2 - x1             2*x1 - 1     2*x1 - 1      2*x1 - 1]
  [0   1   1       x1^2   0   0    1   x1^2 - x1                 x1^2   -x1^2 + x1    -x1^2 + x1]
  [0   0   0          0   1   1   -1   -2*x1 + 1   -2*x1^2 + 3*x1 - 1     2*x1 - 1   2*x1^2 - x1]
in the multivariate polynomial ring in 1 variable over ZZ
avoiding the zero loci of the polynomials
RingElem[x1, x1 - 1, x1^2 + x1 - 1, 2*x1 - 1, x1^2 - 4*x1 + 2, x1^3 - x1^2 + 2*x1 - 1, x1^4 - 3*x1^3 + 7*x1^2 - 5*x1 + 1, x1^2 - 3*x1 + 1, x1^3 - 2*x1^2 - x1 + 1]