Dear Matthieu: A clarification.
In the following: ------------ > Even loops are possible. Yes this could happen for universes with rules of evolution that have a high random or "do not care" content. ------------ While my model would allow a universe with a rather large random or "do not care" content to its rules of succession to visit the same state twice it is extremely unlikely that one would revisit a fixed sequence of states that form a static loop. Hal