wvbaileyWvbailey 19:51, 29 June 2006 (UTC) drawn in Autosketch by wvbailey, 2006-06-29 following proof and illustrations on p. 148-149, Marvin Minsky, Computation: Finite and Infinite Machines, Pentice-Hall, Englewood Cliffs, N.J. 1967.

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