diff --git a/Week03/sequences_besir_secilmis.py b/Week03/sequences_besir_secilmis.py
new file mode 100644
index 00000000..c4c6fc33
--- /dev/null
+++ b/Week03/sequences_besir_secilmis.py
@@ -0,0 +1,17 @@
+def remove_duplicates(seq : list) -> list:
+    return list(set(seq))
+
+def list_counts(seq:list) -> dict:
+    L = {}
+    for i in seq:
+        if i in L:
+            L[i] += 1
+        else:
+            L[i] = 1
+    return L
+
+def reverse_dict(d : dict) -> dict:
+    rd = {}
+    for i, h in d.items():
+        rd[h] = i
+    return rd