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