prolog/problems/family_relations/sister_2/en.py


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id = 96
name = 'sister/2'
slug = 'the sister relation'

description = '''\
<p><code>sister(X, Y)</code>: <code>X</code> is a sister of <code>Y</code>.</p>
<pre>
  ?- sister(vanessa, X).
    X = patricia.
</pre>'''

hint = {}