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A cost-minimized two-stage three-way dynamic consensus mechanism for social network-large scale group decision-making: Utilizing <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si662.svg" display="inline" id="d1e1139"><mml:mi>K</mml:mi></mml:math>-nearest neighbors for incomplete fuzzy preference relations