diff --git a/Week03/pyramid_esra_sepik.py b/Week03/pyramid_esra_sepik.py
new file mode 100644
index 000000000..98ce056b2
--- /dev/null
+++ b/Week03/pyramid_esra_sepik.py
@@ -0,0 +1,7 @@
+def calculate_pyramid_height(number_of_blocks):
+    height = 0
+    used_blocks = 0
+    while used_blocks + (height + 1) <= number_of_blocks:
+        height += 1
+        used_blocks += height
+    return height
diff --git a/Week03/sequences_esra_sepik.py b/Week03/sequences_esra_sepik.py
new file mode 100644
index 000000000..1cb5d5906
--- /dev/null
+++ b/Week03/sequences_esra_sepik.py
@@ -0,0 +1,22 @@
+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 {item: seq.count(item) for item in seq}
+
+
+def reverse_dict(d: dict) -> dict:
+    """
+    This function reverses the keys and values of a dictionary.
+    """
+    reversed_d = {}
+    for key, value in d.items():
+        reversed_d[value] = key
+    return reversed_d