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 = {}