The realization space is
  [1   1   0   0          1      1   0   2*x1 - 1   2*x1 - 1          1      1]
  [0   1   1   1   2*x1 - 1   2*x1   0          0   2*x1 - 1   2*x1 - 1   2*x1]
  [0   1   1   0          0      1   1         x1         x1         x1     x1]
in the multivariate polynomial ring in 1 variable over ZZ
within the vanishing set of the ideal
Ideal (-64*x1^9 + 336*x1^8 - 768*x1^7 + 1004*x1^6 - 824*x1^5 + 434*x1^4 - 142*x1^3 + 26*x1^2 - 2*x1)
avoiding the zero loci of the polynomials
RingElem[x1, x1 - 1, 2, 2*x1 - 1, 2*x1^2 - 2*x1 + 1, 4*x1^2 - 6*x1 + 3, 4*x1^2 - 2*x1 + 1, 4*x1^2 - 5*x1 + 2, 4*x1^2 - 3*x1 + 1]