How to create List of common element from two different List in Dart?

I have Two List.

List<String> A=['1','2','3','4','5'];
List<String> B=['4','5','6','7'];

How to create common element list ?

output

List<String> C=['4','5'];

>Solution :

using .toSet()

List<String> a=['1','2','3','4','5'];
List<String> b=['4','5','6','7'];

List<int> c = a.toSet().where((element) => b.toSet().contains(element)).toList();