2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/68916The definition of principal nest is supplemented with a system of frames that make possible the classification of combinatorial types for every level of the nest. As a consequence, we give necessary and sufficient conditions for the admissibility of a type and prove that given a sequence of non-renormalizable finite admissible types, there is a quadratic polynomial whose nest realizes the sequence.23pages, 8 figuresDynamical Systems37F20text