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func main()
>> t1 := @|10, 20, 30, 10|
= @|10, 20, 30|
>> t1.has(10)
= yes
>> t1.has(-999)
= no
>> t2 := |30, 40|
>> t1.with(t2)
>> |10, 20, 30, 40|
>> t1.without(t2)
>> |10, 20|
>> t1.overlap(t2)
>> |30|
>> |1,2|.is_subset_of(|2,3|)
= no
>> |1,2|.is_subset_of(|1,2,3|)
= yes
>> |1,2|.is_subset_of(|1,2|)
= yes
>> |1,2|.is_subset_of(|1,2|, strict=yes)
= no
>> t1.add_all(t2)
>> t1
= @|10, 20, 30, 40|
>> t1.remove_all(t2)
>> t1
= @|10, 20|
>> |3, i for i in 5|
= |3, 1, 2, 4, 5|
>> empty : |Int| = ||
= ||
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