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name = 'del/3'
slug = 'delete an element from list'
description = '''\
<p><code>del(X, L1, L2)</code>: the list <code>L2</code> is obtained from <code>L1</code> by deleting element <code>X</code>.</p>
<pre>
?- del(1, [1,2,3], L).
L = [2,3].
?- del(2, [1,2,3,2,5], L).
L = [1,3,2,5] ;
L = [1,2,3,5].
?- del(X, [1,2,3], L).
X = 1, L = [2,3] ;
X = 2, L = [1,3] ;
X = 3, L = [1,2].
</pre>'''
hint = {}
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