1 files changed, 13 insertions, 0 deletions
diff --git a/prolog/problems/lists_advanced/len_2/en.py b/prolog/problems/lists_advanced/len_2/en.py
new file mode 100644
index 0000000..3ca963e
--- /dev/null
+++ b/prolog/problems/lists_advanced/len_2/en.py
@@ -0,0 +1,13 @@
+# coding=utf-8
+
+name = 'len/2'
+slug = 'find the length of a list'
+
+description = '''\
+<p><code>len(L, Len)</code>: <code>Len</code> is the length of the list <code>L</code>.</p>
+<pre>
+?- len([1,2,3], Len).
+  Len = 3.
+</pre>'''
+
+hint = {}