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Example of set: $A=\{1;2;3;4\}$ or $B=\{0;1;2;3;4;5\}$. Complement: $A'$. Proper subset: $A\subset B$. Empty set: $\varnothing$. Union of sets: $A\cup B$. Intersection of sets: $A\cap B$. Difference of sets: $A\setminus B$.