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