The realization space is
  [1   1   0          1   0   1   1        0                   x1         1    1]
  [0   1   1   2*x1 - 1   0   0   1   x1 - 1          2*x1^2 - x1   -x1 + 1   x1]
  [0   0   0          0   1   1   1      -x1   -2*x1^2 + 5*x1 - 2        x1   x1]
in the multivariate polynomial ring in 1 variable over ZZ
within the vanishing set of the ideal
Ideal (40*x1^7 - 192*x1^6 + 390*x1^5 - 440*x1^4 + 304*x1^3 - 132*x1^2 + 34*x1 - 4)
avoiding the zero loci of the polynomials
RingElem[x1, 2*x1 - 1, x1 - 1, 3*x1 - 2, 2, 4*x1^2 - 5*x1 + 2, x1 - 2, 4*x1 - 3, 2*x1^2 - 2*x1 + 1, 5*x1 - 2, 5*x1^2 - 6*x1 + 2]