diff --git a/Week03/sequences_sedasengul_ozkaya.py b/Week03/sequences_sedasengul_ozkaya.py
new file mode 100644
index 00000000..898a2739
--- /dev/null
+++ b/Week03/sequences_sedasengul_ozkaya.py
@@ -0,0 +1,20 @@
+def remove_duplicates(items):
+    return list(dict.fromkeys(items))
+
+
+def list_counts(items):
+    counts = {}
+
+    for item in items:
+        counts[item] = counts.get(item, 0) + 1
+
+    return counts
+
+
+def reverse_dict(dictionary):
+    reversed_dict = {}
+
+    for key, value in dictionary.items():
+        reversed_dict[value] = key
+
+    return reversed_dict