name = 'descendant/2'
slug = 'the descendant relation'

description = '''\
<p><code>descendant(X, Y)</code>: <code>X</code> is a descendant (child, grandchild, …) of <code>Y</code>.</p>
<pre>
?- descendant(patricia, X).
  X = william ;
  X = tina ;
  X = thomas.
</pre>'''

hint = {}