diff --git a/Week03/sequences_buse_demirbas.py b/Week03/sequences_buse_demirbas.py
new file mode 100644
index 00000000..cc0ecc68
--- /dev/null
+++ b/Week03/sequences_buse_demirbas.py
@@ -0,0 +1,17 @@
+def remove_duplicates(seq: list) -> list:
+    """
+    This function removes duplicates from a list.
+    """
+    return list(dict.fromkeys(seq))
+
+def list_counts(seq: list) -> dict:
+    """
+    This function counts the number of occurrences of each item in a list.
+    """
+    return {x: seq.count(x) for x in seq}
+
+def reverse_dict(d: dict) -> dict:
+    """
+    This function reverses the keys and values of a dictionary.
+    """
+    return {v: k for k, v in d.items()}