2-1 routing requests in the hypercube

Considering distances between sources and their respective target in g4, we have, using a computer, studying all the 2-1 routing requests of H4 having similar properties on distances, in order to find more not routable 2-1 routing request in dimension 4 and higher. We have by this way obtained several (a dozen) non routable 2-1 rout- ing requests in H4. Some of them may be extended to higher dimensions, but not all.