title: Finding a subsequence in longer sequence
body: <p>I need to find a sequence in other large sequence, for example, <code>{1,3,2,3}</code> is present in <code>{1,3,2,3,4,3}</code> and <code>{5,1,3,2,3}</code>. Is there any way to do it quickly with <code>IEnumerable</code> or with something else?</p>