|5|
|1/2|
|-5|
|-1/2|
|1 + 3|
|1 + |2 - 5| + 6|
[ |x| | x <- [-2 .. 2] ]
3|5 + 2|
|-3| + |2| + |5|
|2 + {? 3 if true || false, 4 otherwise ?} - 5|
|{}|
|{1,2,3}|
| {1, 3, 1, 2} |
|{1,2,3}| * |-5|
|bag [1,3,1,2]|
|[1,3,1,2]|