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[3] D. Knuth, Seminumerical Algorithms, (Addison-Wesley, 1981).
[4] S. Wolfram, ``Universality and complexity in cellular automata'', Physica 10D, 1 (1984).
[5] R. Rudell, espresso software program, Computer Science Dept., University of California, Berkeley (1985).
[6] C. Feynman and R. Feynman, private communication.