Grouping question

I have the following XML:

<data>
  <n color="R">1</color>
  <n color="R">2</color>
  <n color="R">3</color>
  <n color="Y">4</color>
  <n color="Y">5</color>
  <n color="Y">6</color>
  <n color="W">7</color>
  <n color="W">8</color>
  <n color="W">9</color>
</data>

and I want to create 3 tables (one for each color) with 2 columns each:

<table>
  <tr><td>1</td><td>2</td></tr>
  <tr><td>3</td></tr>
</table>
<table>
  <tr><td>4</td><td>5</td></tr>
  <tr><td>6</td></tr>
</table>

<table>
  <tr><td>7</td><td>8</td></tr>
  <tr><td>9</td></tr>
</table>

I have checked the grouping section in http://www.dpawson.co.uk/xsl/ but
none of the samples do what I need. How can I do that?

Faw


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