diff --git a/Week03/pyramid_sinem_tanriver.py b/Week03/pyramid_sinem_tanriver.py
new file mode 100644
index 000000000..84b9572fa
--- /dev/null
+++ b/Week03/pyramid_sinem_tanriver.py
@@ -0,0 +1,8 @@
+def calculate_pyramid_height(number_of_blocks):
+    height = 0
+    for row in range(1, number_of_blocks + 1):
+        if number_of_blocks < row:
+            break
+        number_of_blocks -= row
+        height += 1
+    return height
diff --git a/Week03/sequences_sinem_tanriver.py b/Week03/sequences_sinem_tanriver.py
new file mode 100644
index 000000000..4b99b024a
--- /dev/null
+++ b/Week03/sequences_sinem_tanriver.py
@@ -0,0 +1,28 @@
+def remove_duplicates(seq: list) -> list:
+    """
+    This function removes duplicates from a list.
+    """
+    seen = set()
+    unique = []
+    for item in seq:
+        if item not in seen:
+            seen.add(item)
+            unique.append(item)
+    return unique
+
+
+def list_counts(seq: list) -> dict:
+    """
+    This function counts the number of occurrences of each item in a list.
+    """
+    counts = {}
+    for item in seq:
+        counts[item] = counts.get(item, 0) + 1
+    return counts
+
+
+def reverse_dict(d: dict) -> dict:
+    """
+    This function reverses the keys and values of a dictionary.
+    """
+    return {value: key for key, value in d.items()}