Переделать код с C# на VB

static IEnumerable<String> f(IEnumerable<IEnumerable<String>> arg)
{
List<string> emp = new List<string>();
emp.Add("");

return arg.Aggregate(emp as IEnumerable<string>,
(total, next) => total.SelectMany( (x) => next.Select( (y) => x + y)));
}

Function Permutate(ByVal arg As IEnumerable(Of String)) As IEnumerable(Of String)

Dim emp As New List(Of String)
emp.Add(String.Empty)

Return arg.Aggregate(emp.AsEnumerable, Function(total, nxt) total.SelectMany(Function(x) nxt.Select(Function(y) x + y)))

End Function