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Synopsis Relation excluding certain range values.
Function rel[&T0,&T1] rangeX (rel[&T0,&T1] R, set[&T2] S)
Usage import Relation;
Description Restriction of binary relation R to tuples with second element not in set S.
Examples 
rascal>import Relation;
ok
rascal>rangeX({<1,10>, <2,20>, <3,30>}, {30, 10});
rel[int,int]: {<2,20>}

Questions
Question [1].
The type of rangeX({<7, 13>, <2, 13>}, {3, 4, 5, 18}) is

Question [2]. 
rangeX({<7, 15>, <6, 11>, <0, 19>, <0, 17>, <7, 19>}, {3, 18, 4, 11, 2}) ==



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