1 files changed, 49 insertions, 0 deletions
diff --git a/prolog/en.py b/prolog/en.py
index 17a6fc4..f31eab4 100644
--- a/prolog/en.py
+++ b/prolog/en.py
@@ -32,4 +32,53 @@ hint = {
     'monkey_remove': '''\
 <p>Remove the highlighted part.</p>
 ''',
+
+    'monkey_highlight': None,  # used to highlight erroneous tokens
+
+    'monkey_buggy_literal': [
+'''\
+<p>Consider the highlighted values in the following program fragment:</p>
+<ul class="code" style="list-style: square inside; padding-left: 2em;">[%=fragments%]</ul>
+''',
+'''\
+<p>Do all values have the correct type (number/list/structure/…)? Do the highlighted arguments appear in correct relations with other objects in the program?</p>
+'''
+    ],
+
+    'monkey_buggy_variable': [
+'''\
+<p>The variable <code>[%=variable%]</code> is used incorrectly. Pay particular attention to the following program ragments:</p>
+<ul class="code" style="list-style: square inside; padding-left: 2em;">[%=fragments%]</ul>
+''',
+'''\
+<p>Are all goals referencing the variable <code>[%=variable%]</code> correct?
+Check whether you are using the right predicate or operator, and that the highlighted arguments make sense.</p>
+<p>Do all occurrences of <code>[%=variable%]</code> denote the same value?
+In Prolog rules, each variable can only refer to a single value (e.g. person or number).</p>
+'''
+    ],
+
+    'monkey_singleton': [
+'''\
+<p>The highlighted variable <code>[%=variable%]</code> appears only once in a rule:</p>
+<ul class="code" style="list-style: square inside; padding-left: 2em;">[%=fragments%]</ul>
+''',
+'''\
+<p>This is usually an error. Should the value denoted by the variable <code>[%=variable%]</code> appear anywhere else in the rule? Also check your program for typos.</p>
+'''
+    ],
+
+    'monkey_missing': '''\
+<p>The program is partially correct, but not complete yet. Perhaps a goal is missing in one of the clauses, or another rule is needed.</p>
+''',
+
+    'monkey_unknown': [
+'''\
+<p>Consider the highlighted program fragments:</p>
+<ul class="code" style="list-style: square inside; padding-left: 2em;">[%=fragments%]</ul>
+''',
+'''\
+<p>This pattern does not occur in known solutions to this problem. This can indicate a mistake in the program, or that you are implementing a novel solution.</p>
+'''
+    ],
 }