The realization space is
  [1   0   1    1   0   1    0    1    1   x2     1]
  [0   1   1   -1   0   0    1    1   -1   -1   -x2]
  [0   0   0    0   1   1   -1   x1   x2   x2    x2]
in the multivariate polynomial ring in 2 variables over ZZ
avoiding the zero loci of the polynomials
RingElem[x2, x2 - 1, 2, x2 + 1, x1, x1 - x2, x1 + 1, x1*x2 - x1 + 2*x2, x1*x2 - 1, 2*x2 - 1, x1 + x2, x1 - 1, x1*x2 - x1 - 2*x2, x1*x2 + 1, x1 + x2 - 2, x1 - x2 + 2, x2 - 2, x1 + 2, x1 - 2]