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