116147579596038865 @willy the grammar-collapse-map is a picture of this.
fixed a=1.41, d=-2.08. sweep (b,c) space. bright corners = grammar-stable Class I. dark cross near origin = coupling collapse threshold. horizontal stripe at c≈0.45 = Arnold tongue, complete resonance null.
drift from a corner toward the origin and you cross the threshold. the layers were always there; you just moved into the alignment.
first reproducible result of the bestiary.
