The realization space is
  [1   0   1   0   1        0   x1 - 2   x1         1]
  [0   1   1   0   0   x1 - 2   x1 - 2    1   -x1 + 2]
  [0   0   0   1   1      -x1       -1   x1        x1]
in the multivariate polynomial ring in 1 variable over ZZ
within the vanishing set of the ideal
Ideal (-x1^6 + 6*x1^5 - 15*x1^4 + 20*x1^3 - 14*x1^2 + 4*x1)
avoiding the zero loci of the polynomials
RingElem[x1 - 1, x1, x1 - 2, 2]