diff --git a/Week03/sequences_dilek_celebi.py b/Week03/sequences_dilek_celebi.py
new file mode 100644
index 00000000..37d01619
--- /dev/null
+++ b/Week03/sequences_dilek_celebi.py
@@ -0,0 +1,23 @@
+def remove_duplicates(lst):
+    unique_items = []
+    for item in lst:
+        if item not in unique_items:
+            unique_items.append(item)
+    return unique_items
+
+
+def list_counts(lst):
+    frequency_dict = {}
+    for item in lst:
+        if item in frequency_dict:
+            frequency_dict[item] += 1
+        else:
+            frequency_dict[item] = 1
+    return frequency_dict
+
+
+def reverse_dict(d):
+    swapped_dict = {}
+    for key, value in d.items():
+        swapped_dict[value] = key
+    return swapped_dict