diff --git a/Week04/test_decorators.py b/Week04/test_decorators.py
index 2f89b9fb..cf453ca0 100644
--- a/Week04/test_decorators.py
+++ b/Week04/test_decorators.py
@@ -1,44 +1,26 @@
-import os
-import inspect
-import time
-import random
+from typing import List, Dict, Any
 
+def remove_duplicates(seq: List) -> List:
+    seen = set()
+    result = []
+    for item in seq:
+        if item not in seen:
+            seen.add(item)
+            result.append(item)
+    return result
 
-files = [f for f in os.listdir(os.path.dirname(__file__)) if f.startswith("decorators")]
-for f in files:
-    exec("import " + f[:-3] + " as " + f[:-3])
+def list_counts(seq: List) -> Dict
+    counts = {}
+    for item in seq:
+        if item in counts:
+            counts[item] += 1
+        else:
+            counts[item] = 1
+    return counts
 
+def reverse_dict(d: Dict) -> Dict:
+    reversed_d = {}
+    for key, value in d.items():
+        reversed_d[value] = key
+    return reversed_d
 
-def test_names():
-    for f in files:
-        assert "performance" in dir(eval(f[:-3])), "timer is not defined in " + f[:-3]
-
-def test_callables():
-    for f in files:
-        assert callable(eval(f[:-3]).performance), "timer is not callable in " + f[:-3]
-
-def test_performance():
-    for f in files:
-        @eval(f[:-3]).performance
-        def dummy_timer(x):
-            time.sleep(x)
-        @eval(f[:-3]).performance
-        def dummy_memory(x):
-            return [random.randint(0, 100) for _ in range(x)]
-        dummy_timer(1)
-        assert eval(f[:-3]).performance.counter == 1, \
-            "performance is not working in " + f[:-3] + " (counter)"
-        assert eval(f[:-3]).performance.total_time > 1, \
-            "performance is not working in " + f[:-3] + " (total_time)"
-        dummy_timer(1)
-        dummy_timer(2)
-        dummy_timer(3)
-        assert eval(f[:-3]).performance.counter == 4, \
-            "performance is not working in " + f[:-3] + " (counter)"
-        assert eval(f[:-3]).performance.total_time > 7, \
-            "performance is not working in " + f[:-3] + " (total_time)"
-        dummy_memory(1000000)
-        assert eval(f[:-3]).performance.counter == 5, \
-            "performance is not working in " + f[:-3] + " (counter)"
-        assert eval(f[:-3]).performance.total_mem > 8.e6, \
-            "performance is not working in " + f[:-3] + " (total_mem)"