Remove space-padding from <pre> blocks

1 files changed, 2 insertions, 2 deletions

diff --git a/prolog/problems/denotational_semantics/prog_listswap_3/en.py b/prolog/problems/denotational_semantics/prog_listswap_3/en.py
index 5e85ce6..ad9dcf8 100644
--- a/prolog/problems/denotational_semantics/prog_listswap_3/en.py
+++ b/prolog/problems/denotational_semantics/prog_listswap_3/en.py
@@ -9,8 +9,8 @@ description = '''\
 <p>The meaning of a word (program) in this language has the form <code>In-->Out</code>, mapping from input to output lists. Besides the list contents, internal states also hold the current cursor position. The <code>left</code> and <code>right</code> instructions move the cursor one step in the given direction, while the <code>swap</code> instruction swaps the element under the cursor with its left neighbor (and fails if cursor is currently pointing to the first element of the list).</p>
 
 <pre>
-  ?- prog_listswap([1,2,3,4]-->Out, [begin,right,swap,end], []).
-    Out = [2,1,3,4].
+?- prog_listswap([1,2,3,4]-->Out, [begin,right,swap,end], []).
+  Out = [2,1,3,4].
 </pre>
 
 <p>Helper predicate (already defined):<br />