Prolog: add <code> tags for sister/2 hints

1 files changed, 5 insertions, 3 deletions

diff --git a/prolog/problems/family_relations/sister_2/en.py b/prolog/problems/family_relations/sister_2/en.py
index cbd975b..46babf0 100644
--- a/prolog/problems/family_relations/sister_2/en.py
+++ b/prolog/problems/family_relations/sister_2/en.py
@@ -45,8 +45,9 @@ For example: <code>X \== Y</code></p>
 ''',
 
     'neq+_instead_of_neq': '''\
-<p>Use the operator \== instead of operators \= or =\=. It succeeds when the two operands are not the same,
-while \= succeeds if the operands <em>cannot be made</em> the same (cannot be unified), and =\= checks for
+<p>Use the operator <code>\==</code> instead of operators <code>\=</code> or <code>=\=</code>.
+It succeeds when the two operands are not the same,
+while <code>\=</code> succeeds if the operands <em>cannot be made</em> the same (cannot be unified), and <code>=\=</code> checks for
 arithmetic inequality and in this case both operands should be immediately arithmetically computable.</p>
 ''',
 
@@ -75,7 +76,8 @@ something similarly impossible).</p>
 ''',
 
     'final_hint': '''\
-<p>In this exercise you used the \== operator. It succeeds if its two operands are not the same
+<p>In this exercise you used the <code>\==</code> (or <code>\=</code>) operator.
+It succeeds if its two operands are not the same
 <em>at the moment</em> of comparison. If you put this goal at the start of your rule, it will
 not work as expected. (Go ahead, try and see what happens!)</p>
 ''',