How should I Arrange my data?
<p>I'd like to log the CPU percentage of each process in different times. I need a data struct that will allow me to save the data like this:</p>

<ul>
<li>Explorer.EXE
<ul>
<li>19:03 | 47%</li>
<li>19:05 | 14%</li>
<li>19:08 | 24%</li>
</ul></li>
<li>Firefox.EXE
<ul>
<li>19:03 | 21%</li>
<li>19:05 | 14%</li>
<li>19:08 | 2%</li>
</ul></li>
<li>Messenger.EXE
<ul>
<li>19:03 | 11%</li>
<li>19:05 | 12%</li>
<li>19:08 | 11%</li>
</ul></li>
</ul>

<p>What's the right way to do it? I thought about tuples inside lists inside a list, but the identifier for a list is not a string but a number.</p>
