1 files changed, 14 insertions, 0 deletions
diff --git a/prolog/problems/trees/membert_2/en.py b/prolog/problems/trees/membert_2/en.py
new file mode 100644
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+++ b/prolog/problems/trees/membert_2/en.py
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+id = 142
+name = 'memberT/2'
+slug = 'find elements in a tree'
+
+description = '''\
+<p><code>memberT(X, T)</code>: <code>X</code> is an element of the tree <code>T</code>. A tree node is represented with the structure <code>t(E, T1, T2...)</code>, where <code>E</code> is the node's value, followed by any number of subtrees. An empty tree is denoted by <code>nil</code>.</p>
+<pre>
+  ?- memberT(X, t(3, t(1), t(2))).
+    X = 3 ;
+    X = 1 ;
+    X = 2.
+</pre>'''
+
+hint = {}