diff --git a/ocl.py b/ocl.py
index 4f9a6f05..093f649d 100644
--- a/ocl.py
+++ b/ocl.py
@@ -535,7 +535,11 @@ def union(s,t) :
 def unionSequence(s,t) :
   res = []
   res.extend(s)
-  res.extend(t)
+  
+  # Add all elements of t that are not in s (Prevents duplicates)
+  new_res = [x for x in t if x not in s]
+  res.extend(new_res)
+
   return res
 
 
diff --git a/oclfile.py b/oclfile.py
index 7f7795d1..dfd83e81 100644
--- a/oclfile.py
+++ b/oclfile.py
@@ -4,6 +4,8 @@
 import pickle
 import socket
 import tempfile
+import gc 
+
 
 from enum import Enum
 
@@ -11,6 +13,15 @@
 def free(x):
   del x
 
+  # Garbage Collection
+  try:
+    gc.collect()
+  except Exception as e:
+    pass 
+  else:
+    pass
+
+
 
 class OclFile:
   oclfile_instances = []