were useful for a previous version of the program, but are no longer needed).
            Large blocks of unused code, even when turned into comments, are confusing to
            readers. Feel free to keep your old implementations in a separate file for
            your own use, but don't turn them in as your finished product.</li>
          <li><strong>Brevity</strong>. An idea expressed in four lines of code is often clearer than
            the same idea expressed in forty. You do not need to try to min