How to prevent column break within an element?

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Consider the following HTML:

<div class="x">
    <ul>
        <li>Number one</li>
        <li>Number two</li>
        <li>Number three</li>
        <li>Number four is a bit longer</li>
        <li>Number five</li>
    </ul>
</div>

and the following CSS:

.x {
    -moz-column-count: 3;
    column-count: 3;
    width: 30em;
}

As it stands, Firefox currently renders this similarly to the following:

• Number one    • Number three          bit longer
• Number two    • Number four is a    • Number five

Notice that the fourth item was split between the second and third column. How do I prevent that?

The desired rendering might look something more like:

• Number one    • Number four is a
• Number two      bit longer
• Number three  • Number five

or

• Number one    • Number three        • Number five
• Number two    • Number four is a
                  bit longer

Edit: The width is only specified to demonstrate the unwanted rendering. In the real case, of course there is no fixed width.

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