  Consider the projective coordinate ring of the GIT quotient (P^1)^n//SL(2),
with the usual linearization, where n is even. In 1894, Kempe proved that this
ring is generated in degree one. In [HMSV2] we showed that, over the rationals,
the relations between degree one invariants are generated by a class of
quadratic relations -- the simplest binomial relations -- with the exception of
n=6, where there is a single cubic relation. The purpose of this paper is to
show that these results hold over Z[1/12!], and to suggest why they may be true
over Z[1/6].
