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