The realization space is
  [1   1   0   x1 - 1   0   1   1        0             x1 - 1         1    1]
  [0   1   1    -x1^2   0   0   1   x1 - 1              -x1^2        x1   x1]
  [0   0   0        0   1   1   1      -x1   -x1^2 + 2*x1 - 1   -x1 + 1   x1]
in the multivariate polynomial ring in 1 variable over ZZ
within the vanishing set of the ideal
Ideal (4*x1^7 - 14*x1^6 + 24*x1^5 - 23*x1^4 + 11*x1^3 - 2*x1^2)
avoiding the zero loci of the polynomials
RingElem[x1, 2*x1 - 1, x1 - 1, 2*x1^2 - 2*x1 + 1, 2, 3*x1^2 - 3*x1 + 1, x1^2 + x1 - 1, x1^3 + 2*x1^2 - 3*x1 + 1, x1^2 - x1 + 1, 2*x1^3 - 2*x1^2 + 2*x1 - 1, x1^3 + x1^2 - 2*x1 + 1]