[xsl] Extract unique values

Hi all,
I want to extract all the <c> from the following xml with uniqe values. So in 
the transformed, no two <c> element should have same values. 
<?xml version="1.0" encoding="UTF-8"?>
<a>
        <b>
                <c>1234</c>
                <d>23</d>
        </b>
        <b>
                <c>1234</c>
                <d>24</d>
        </b>
        <b>
                <c>5678</c>
                <d>25</d>
        </b>
        <b>
                <c>1234</c>
                <d>25</d>
        </b>
</a>
Thanks,
Navpreet



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