In this paper, composition of set-valued decision tables are discussed based on the quasi-order relation on set-valued decision tables. Based on the theory of the three-way decisions, decision method of the set-valued decision tables are discussed, the three-way decisions of the object-composed set-valued decision tables and the three-way decisions of the attribute-composed set-valued decision tables are also discussed. Furthermore, the three-way decisions of composed set-valued decision tables are discussed.
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