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We thank the referee for a number of useful suggestions, including the choice of a more suitable title. We also pose two problems recommended by him at the end of the paper.
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Chong, C.T. Minimalα-hyperdegrees. Arch math Logik 24, 63–71 (1984). https://doi.org/10.1007/BF02007141
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DOI: https://doi.org/10.1007/BF02007141