Create a linked hash set from elements.
Creates a linked hash set as by new LinkedHashSet<E>() and adds each element of elements to this set in the order they are iterated.
factory LinkedHashSet.of(Iterable<E> elements) =>
LinkedHashSet<E>()..addAll(elements);
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https://api.dart.dev/stable/2.5.0/dart-collection/LinkedHashSet/LinkedHashSet.of.html