3">O &lt;- 1<br>
</font><font face="Arial" color="#000100" size="1">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</font><font face="Arial" color="#000100" size="3">O ~ dbern(constraint)<br>
</font><font face="Arial" color="#000100" size="1">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</font><font face="Arial" color="#000100" size="3">constraint &lt;- step(x * x + y * y - 1)<br>
</font><font face="Arial" color="#000100" size="1">&nbsp;&nbsp;&nbsp;
</font><font face="Arial" color="#000100" size="3">}<br><br>
</font><font fa