Remove space-padding from <pre> blocks

1 files changed, 4 insertions, 4 deletions

diff --git a/prolog/problems/trees/deletebt_3/en.py b/prolog/problems/trees/deletebt_3/en.py
index 215fced..eedab0a 100644
--- a/prolog/problems/trees/deletebt_3/en.py
+++ b/prolog/problems/trees/deletebt_3/en.py
@@ -6,10 +6,10 @@ slug = 'delete an element from a binary tree'
 description = '''\
 <p><code>deleteBT(X, T, NewT)</code>: the binary tree <code>NewT</code> is obtained from <code>T</code> by deleting one occurence of the element <code>X</code>. If <code>X</code> is not a leaf node, the root of one of its subtrees is moved up. Your code should generate all valid solutions.</p>
 <pre>
-  ?- deleteBT(1, b(b(b(nil,4,nil),2,b(nil,6,nil)),1,b(nil,3,b(nil,5,nil))), T).
-    T = b(b(nil,4,b(nil,6,nil)),2,b(nil,3,b(nil,5,nil))) ;
-    T = b(b(b(nil,4,nil),6,nil),2,b(nil,3,b(nil,5,nil))) ;
-    T = b(b(b(nil,4,nil),2,b(nil,6,nil)),3,b(nil,5,nil)).
+?- deleteBT(1, b(b(b(nil,4,nil),2,b(nil,6,nil)),1,b(nil,3,b(nil,5,nil))), T).
+  T = b(b(nil,4,b(nil,6,nil)),2,b(nil,3,b(nil,5,nil))) ;
+  T = b(b(b(nil,4,nil),6,nil),2,b(nil,3,b(nil,5,nil))) ;
+  T = b(b(b(nil,4,nil),2,b(nil,6,nil)),3,b(nil,5,nil)).
 </pre>'''
 
 hint = {}