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Synopsis Sum the elements of a list.
Function num sum(list[num] l)
Usage import List;
Examples 
rascal>import List;
ok
rascal>sum([3, 1, 4, 5]);
num: 13
rascal>sum([3, 1.5, 4, 5]);
num: 13.5

Questions
Question [1].
The type of sum([16, 13.3452476889635080]) is

Question [2]. 
sum([-18, -3]) ==



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