blue wrote:On the automorhpsm count: since applying two transformations in succession and normalizing the result, produces the same result as transforming twice and normalizing after each transformation, it follows that VPT parts of the (automorphic) transformations, form a subgroup of the full group of VPT's. From that, it follows that that the number of automorphisms is always a factor of 3359232 ... just like for single grids.
If we say about (G1,...,Gk) automorphisms, maximal number of automorphisms should be "k!" multiplied by a factor of 3359232 (not more than k! x 648), isn't it?
Serg
