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The authors are grateful to the National Science Foundation (GP 3623) for its support.
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Bednarek, A.R., Wallace, A.D. Finite approximants of compact totally disconnected machines. Math. Systems Theory 1, 209–216 (1967). https://doi.org/10.1007/BF01703819
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DOI: https://doi.org/10.1007/BF01703819