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Article History
Received: 13 September 2024
Accepted: 13 March 2025
First Online: 4 May 2025
Declarations
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: Not applicable.
: The key idea of the new proof was already published in Japanese by Maruzen Publisher in [] (note that it was not included in []). In this paper, we have reorganized the proof, incorporating further corrections and new examples not present in []. We have obtained permission from the publisher to present this work in English and submit it to a scientific journal.
