diff --git a/notes-and-examples/2026.05.06/homework.py b/notes-and-examples/2026.05.06/homework.py
new file mode 100644
index 0000000..9f9cc39
--- /dev/null
+++ b/notes-and-examples/2026.05.06/homework.py
@@ -0,0 +1,18 @@
+# 
+
+class Student:
+    def __init__(self, name: str, year: int):
+        self.name = name
+        self.year = year
+
+# homework: implement this Queue which orders students by year.
+# students with a higher year are placed in front of students with a lower year
+class Queue:
+    pass
+
+    def append(self, student: Student):
+        pass
+
+    def popleft(self) -> Student:
+        return Student(name="", year=0)
+
diff --git a/notes-and-examples/2026.05.06/registration.py b/notes-and-examples/2026.05.06/registration.py
deleted file mode 100644
index 84b6dda..0000000
--- a/notes-and-examples/2026.05.06/registration.py
+++ /dev/null
@@ -1,45 +0,0 @@
-# from 2026.02.28
-class Node:
-    next_node: "None | Node" = None
-    prev_node: "None | Node" = None
-
-    def __init__(self, value):
-        self.value = value
-
-class Queue:
-    front: "Node | None" = None
-    back: "Node | None" = None
-
-    def append(self, value):
-        if self.back is None:
-            self.front = Node(value)
-            self.back = self.front
-        else:
-            new_node = Node(value)
-            self.back.prev_node = new_node
-            new_node.next_node = self.back
-            self.back = new_node
-    
-    def popleft(self):
-        if self.front is not None:
-            prev_front = self.front
-
-            prev_node_in_queue = self.front.prev_node
-            self.front.next_node = None
-            self.front.prev_node = None
-            if prev_node_in_queue is not None:
-                prev_node_in_queue.next_node = None
-
-            self.front = prev_node_in_queue
-            
-            return prev_front
-        else:
-            return None
-
-    def print_queue(self):
-        current_node = self.front
-        while current_node is not None:
-            print(current_node.value)
-            current_node = current_node.prev_node
-
-# from today