9. multi-column text

It is very common to see text in multiple columns on newspaper, please achieve something similar in this problem.

Suppose you have HTML structure like below.

<div class="three-column-text">
  some very very long text
</div>

Complete the CSS code according to following requirements

1. divide into 3 columns
2. use 1px line of #ddd as separator
3. adding 10px space around each column, to container border and to the separator

The text used in test doesn't contain space but has forced line break to show padding/margin clearly.