diff --git a/Week03/sequence_elifsude_yilmaz.py b/Week03/sequence_elifsude_yilmaz.py
new file mode 100644
index 00000000..a5f747c8
--- /dev/null
+++ b/Week03/sequence_elifsude_yilmaz.py
@@ -0,0 +1,15 @@
+def remove_duplicates(data):
+    result = []
+    for item in data:
+        if item not in result:
+            result.append(item)
+    return result
+
+def list_counts(data):
+    counts = {}
+    for item in data:
+        counts[item] = counts.get(item, 0) + 1
+    return counts
+
+def reverse_dict(d):
+    return {v: k for k, v in d.items()}