public IEnumerable<int> A(){ for (int i = 0; i <= 10; i += 2) yield return i;}public IEnumerable<int> B(){ var ints = new List<int>(); for (int i = 0; i <= 10; i += 2) ints.Add(i); return ints;}
public IEnumerable<int> A(){ for (int i = 0; i <= 10; i += 2) yield return i;}public IEnumerable<int> B(){ var ints = new List<int>(); for (int i = 0; i <= 10; i += 2) ints.Add(i); return ints;}