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Synopsis Remove multiple occurrences of elements in a list. The first occurrence remains.
Function list[&T] dup(list[&T] lst)
Usage import List;
Examples 
rascal>import List;
ok
rascal>dup([3, 1, 5, 3, 1, 7, 1, 2]);
list[int]: [3,1,5,7,2]

Questions
Question [1].
The type of dup([false, false, true, false, false]) is

Question [2]. 
dup([false,true,true,true,false,true,true,true,true,false]) ==



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