1 files changed, 9 insertions, 9 deletions
diff --git a/prolog/problems/lists/del_3/en.py b/prolog/problems/lists/del_3/en.py
index d7e38e8..42ca19f 100644
--- a/prolog/problems/lists/del_3/en.py
+++ b/prolog/problems/lists/del_3/en.py
@@ -6,15 +6,15 @@ 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].
+?- 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 = {}