  By assuming there exist three massive non-degenerate Majorana neutrinos, it
is possible to describe neutrino mixing with a residual, unbroken discrete
Klein subgroup of a larger spontaneously broken flavor symmetry group.
Motivated by forthcoming measurements of leptonic CP violation, we revisit this
framework by applying group presentation rules to it. We develop a method that
is able to reproduce all previous results in the literature and may also hint
at a possible group theoretical origin of CP violation in the Klein symmetry
elements. This is due to the explicit appearance of a phase in them. However,
for the cases considered in this analysis, it turns out that this phase can be
removed. Still, this new method warrants further study.
