The realization space is
  [1   0   1       x1   0   1           1    0    1   x1      x1^2 + x1 - 1]
  [0   1   1   x1 + 1   0   0           0    1    1    1                 x1]
  [0   0   0        0   1   1   x1^2 + x1   -1   x1   x1   x1^3 + x1^2 - x1]
in the multivariate polynomial ring in 1 variable over ZZ
avoiding the zero loci of the polynomials
RingElem[x1 + 1, x1 - 1, x1^2 - 2, x1, x1^3 - x1 + 1, x1^2 + x1 - 1, x1^4 + x1^3 - x1^2 - x1 + 1, x1^3 + x1^2 - 1]