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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 = {}
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