The realization space is
  [1   0   1         1   0   1      x1^2    0   x1     1     1]
  [0   1   1   -x1 + 1   0   0         0    1   x1   -x1   -x1]
  [0   0   0         0   1   1   -x1 + 1   -1   -1     1    x1]
in the multivariate polynomial ring in 1 variable over ZZ
avoiding the zero loci of the polynomials
RingElem[x1 - 1, x1, x1 + 1, x1^2 + 1, x1^2 + x1 + 1, 2, x1^3 + x1 - 1, x1^3 + x1^2 - 1, x1^2 + x1 - 1, x1^2 - x1 + 1, 2*x1^2 - 1]