diff --git a/Week03/sequences_berkin_yildirim.py b/Week03/sequences_berkin_yildirim.py
new file mode 100644
index 00000000..3b0048fa
--- /dev/null
+++ b/Week03/sequences_berkin_yildirim.py
@@ -0,0 +1,23 @@
+def remove_duplicates(seq: list) -> list:
+    seen = []
+    result = []
+    for item in seq:
+        if item not in seen:
+            seen.append(item)
+            result.append(item)
+    return result
+
+def list_counts(seq: list) -> dict:
+    counts = {}
+    for item in seq:
+        if item in counts:
+            counts[item] += 1
+        else:
+            counts[item] = 1
+    return counts
+
+def reverse_dict(d: dict) -> dict:
+    reversed_dict = {}
+    for key, value in d.items():
+        reversed_dict[value] = key
+    return reversed_dict