title: Finding an item within a list within another list?
body: <p>Okay, so let's say I have a <code>List&lt;car&gt;</code>. Each car also contains a <code>List&lt;part&gt;</code>. Each part has an <code>ID</code> associated with it. I'm only given the <code>ID</code> to a <code>part</code>, and I want to find the <code>car</code> that contains that <code>part</code>. What is the best way to find this <code>car</code>?</p>