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The preparation of this paper was supported by a grant from the National Science Foundation, NSF-GP-5497.
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Weinbaum, C.M. Partitioning a primitive word into a generating set. Math. Ann. 181, 157–162 (1969). https://doi.org/10.1007/BF01350635
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DOI: https://doi.org/10.1007/BF01350635