lparen'>(</span><span class='id identifier rubyid_colour'>colour</span><span class='rparen'>)</span>
   <span class='id identifier rubyid_index'>index</span><span class='period'>.</span><span class='id identifier rubyid_nil?'>nil?</span> <span class='op'>?</span> <span class='id identifier rubyid_index'>index</span> <span class='op'>:</span> <span class='id identifier rubyid_index'>index</span> <span class='op'>+</span> <span class='int'>1</span>
<span class='kw'>end</span></pre>
    </td>
  </tr>
</table