var sourceSequence = new int[] { 1, 1, 2, 3, 7, 7, 8, 8, 16, 23 };
//лучше, чем
int[] sourceSequence = new int[] { 1, 1, 2, 3, 7, 7, 8, 8, 16, 23 };
IEnumerable<int> sourceSequence = new int[] { 1, 1, 2, 3, 7, 7, 8, 8, 16, 23 };