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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
The proposed model’s confusion matrixes for the different numbers of scales: (a) single scale, (b) two scales, (c) three scales, (d) four scales, and (e) five scales.