Remove space-padding from <pre> blocks

1 files changed, 4 insertions, 4 deletions

diff --git a/prolog/problems/lists/dup_2/en.py b/prolog/problems/lists/dup_2/en.py
index c1d0c1a..b3f3f52 100644
--- a/prolog/problems/lists/dup_2/en.py
+++ b/prolog/problems/lists/dup_2/en.py
@@ -6,10 +6,10 @@ slug = 'duplicate the elements of a list'
 description = '''\
 <p><code>dup(L1, L2)</code>: the list <code>L2</code> is obtained from <code>L1</code> by duplicating every element.</p>
 <pre>
-  ?- dup([1,2], X).
-    X = [1,1,2,2].
-  ?- dup([1,2,3], X).
-    X = [1,1,2,2,3,3].
+?- dup([1,2], X).
+  X = [1,1,2,2].
+?- dup([1,2,3], X).
+  X = [1,1,2,2,3,3].
 </pre>'''
 
 hint = {}