Remove space-padding from <pre> blocks

1 files changed, 2 insertions, 2 deletions

diff --git a/prolog/problems/trees/mirrorbt_2/en.py b/prolog/problems/trees/mirrorbt_2/en.py
index 85c2a54..7bc622f 100644
--- a/prolog/problems/trees/mirrorbt_2/en.py
+++ b/prolog/problems/trees/mirrorbt_2/en.py
@@ -6,8 +6,8 @@ slug = 'flip a binary tree horizontally'
 description = '''\
 <p><code>mirrorBT(T, NewT)</code>: the binary tree <code>NewT</code> is obtained from <code>T</code> by flipping it over the vertical axis through the root node.</p>
 <pre>
-  ?- mirrorBT(b(b(b(nil,4,nil),2,b(nil,5,nil)),1,b(nil,3,nil)), X).
-    X = b(b(nil,3,nil), 1, b(b(nil,5,nil), 2, b(nil,4,nil))).
+?- mirrorBT(b(b(b(nil,4,nil),2,b(nil,5,nil)),1,b(nil,3,nil)), X).
+  X = b(b(nil,3,nil), 1, b(b(nil,5,nil), 2, b(nil,4,nil))).
 </pre>'''
 
 hint = {}