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The author would like to thank Professors S. Rolewicz and V. V. Gorokhovik for helpful discussions. Moreover, the author is grateful to Prof. D. Przeworska-Rolewicz for correcting the first version of this paper. The author would like to thank the referees for their valuable comments and for sending reference [8].
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Song, W. A note on connectivity of efficient solution sets. Arch. Math 65, 540–545 (1995). https://doi.org/10.1007/BF01194174
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DOI: https://doi.org/10.1007/BF01194174