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Synopsis Returns the list 0,1..n-1.
Function list[int] upTill(int n)
Usage import List;
Description Returns the list 0, 1, .., n-1, this is slightly faster than [0..n], since the returned values are shared.
Examples 
rascal>import List;
ok
rascal>upTill(10);
list[int]: [0,1,2,3,4,5,6,7,8,9]

Questions
Question [1].
The type of upTill(2) is

Question [2]. 
upTill(2) ==

Question [3]. 
size(upTill(2)) ==



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