How to subtract List ?

how to subtract List ?
subtract rule
List1=["a","b","c"]
List2=["a","b","c","d"];
List2-List1="d".
i dont find any subtract method in ArrayList . how do i do it ?

Because it isn't called subtract it's called removeAll(Collection c);
list2.removeAll(list1);Leaves list2 with "d"

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