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Connection number (set pair analysis)
D- numbers and their variants
Fuzzy sets and their variants
Grey System Theory and their variants
Intuitionistic fuzzy sets and their variants
Neutrosophic sets and their variants
Other
Picture fuzzy sets and their variants
Plithogenic sets and their variants
Pythagorean fuzzy sets and their variants
Soft sets and their variants
Spherical fuzzy sets
Type-2 fuzzy sets and their variants