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Communicated by Karl H. Hofmann
This author gratefully acknowledges support from the National Science Foundation via grant MCS 81-00733.
An original version of this paper by the first author was received on September 14, 1982.
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Hindman, N., Pym, J. Free groups and semigroups in βN. Semigroup Forum 30, 177–193 (1984). https://doi.org/10.1007/BF02573448
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DOI: https://doi.org/10.1007/BF02573448