diff --git a/check_and_remove_duplicates.py b/check_and_remove_duplicates.py
new file mode 100644
index 0000000..991ca0f
--- /dev/null
+++ b/check_and_remove_duplicates.py
@@ -0,0 +1,11 @@
+import collections
+a = [1,1,1,1,2,2,2,2,3,3,4,5,5]
+counter=collections.Counter(a)
+print(counter)
+# Counter({1: 4, 2: 4, 3: 2, 5: 2, 4: 1})
+print(counter.values())
+# [4, 4, 2, 1, 2]
+print(counter.keys())
+# [1, 2, 3, 4, 5]
+print(counter.most_common(3))
+# [(1, 4), (2, 4), (3, 2)]
\ No newline at end of file