“…At each stage of evolution the symmetries of the faces listed, which are the stabilizer groups of the vertex sets spanning them, are exact code symmetries: the vertices of a face and the codons they represent are equivalent under the stabilizer group, these codons encode the same message. The splitting of the CodonPolytope into smaller faces corresponds with the breaking of the symmetry group of the polytope into the smaller stabilizer groups of the faces, and the polytope splitting model is fully compatible with, and illustrates a more mathematically abstract symmetry breaking model for the evolution of the code [24]. Both models progressively partition the codon set in binary fashion; the five steps above split the polytope into smaller faces containing fewer vertices: [64] Non-saltatory, gradual evolution proceeds in small steps, and in a pre-LUCA, primitive RNA world, the emergent protein synthesis apparatus needs to evolve capacities to recognize codons, anticodons, tRNAs and amino acids.…”