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Synopsis Negated membership test on set values.
Syntax Exp1 notin Exp2
Types
Exp1 Exp2 Exp1 notin Exp2
T1 <: T2 set[T2] bool
Description Yields true if the value of Exp1 does not occur as element in the value of Exp2 and false otherwise. The type of Exp1 should be compatible with the element type of Exp2.
Examples 
rascal>4 notin {1, 2, 3};
bool: true
rascal>4 notin {1, 2, 3, 4};
bool: false

Questions
Question [1].
The type of -6 notin {-18, 11, -4, -9, -14} is

Question [2]. 
96 notin {96,6,12,45,80} ==

Question [3]. 
2 notin {7, 8} ==



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