The realization space is
  [1   0   1   1          1      1   0          2   0          1      1]
  [0   1   1   1   2*x1 - 1   2*x1   0          0   2   2*x1 - 1   2*x1]
  [0   0   0   1   2*x1 - 1      1   1   2*x1 - 1   1         x1     x1]
in the multivariate polynomial ring in 1 variable over ZZ
within the vanishing set of the ideal
Ideal (4*x1^2 - 6*x1 + 3, -16*x1^4 + 56*x1^3 - 64*x1^2 + 28*x1 - 4)
avoiding the zero loci of the polynomials
RingElem[x1, x1 - 1, 2*x1 - 1, 2, 4*x1^2 - 2*x1 + 1, 4*x1^2 - 6*x1 + 1, 2*x1^2 - 2*x1 + 1, 2*x1^2 - 3*x1 + 2, 4*x1 - 3, 2*x1 - 3, 4*x1^2 - 4*x1 + 3]