diff --git a/Week03/sequences_gulsum_ceylan.py b/Week03/sequences_gulsum_ceylan.py
new file mode 100644
index 00000000..4bd01cae
--- /dev/null
+++ b/Week03/sequences_gulsum_ceylan.py
@@ -0,0 +1,18 @@
+
+def remove_duplicates(seq: list) -> list:
+    result = []
+    for item in seq:
+        if item not in result:
+            result.append(item)
+    return result
+
+
+def list_counts(seq: list) -> dict:
+    counts = {}
+    for item in seq:
+        counts[item] = counts.get(item, 0) + 1
+    return counts
+
+
+def reverse_dict(d: dict) -> dict:
+    return {value: key for key, value in d.items()}