diff --git a/file.py b/file.py
index e69de29..6e96b2e 100644
--- a/file.py
+++ b/file.py
@@ -0,0 +1,4 @@
+#write a program that returns a list that contains only the elements that are common between the lists 
+a = set([1, 1, 2, 4, 6, 7])
+b = set([1, 2, 3, 4, 5, 6])
+print (set(a & b))