  We consider cascades of enzymatic Goldbeter-Koshland loops with any number n
of layers, for which there exist two layers involving the same phosphatase.
Even if the number of variables and the number of conservation laws grow
linearly with n, we find explicit regions in reaction rate constant and total
conservation constant space for which the associated mass-action kinetics
dynamical system is multistationary. Our computations are based on the
theoretical results of our companion paper in arXiv:1807.05157, which are
inspired by results in real algebraic geometry by Bihan, Santos and
Spaenlehauer.
