The first example we consider is a stack of ten benzene molecules at an inter-molecular distance of 3.0 Å, and orbitals that are fragment-localized, i.e. they are natural, Hückel-like orbitals on each benzene. The CAS(60,60) was ten times the minimal active space of six electrons in six π-orbitals for one benzene unit. As we showed in a previous publication, the system as a whole is dominated by excitations inside each fragment. Additionally, incorporating single excitations between the fragments is enough to recover Full CI energy.