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Synopsis Determine the number of elements in a set.
Function int size(set[&T] st)
Usage import Set;
Examples 
rascal>import Set;
ok
rascal>size({1,2,3,4});
int: 4
rascal>size({"elephant", "zebra", "snake"});
int: 3
rascal>size({});
int: 0

Questions
Question [1]. 
size({  }) == 2

Question [2]. Create a set of the right size.
Fill in 
import Set;
set[str] text = ;
and make the following true:
size(text) == 0;



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