diff --git a/build.py b/build.py
index 6d455db..2817e1d 100644
--- a/build.py
+++ b/build.py
@@ -1,9 +1,12 @@
 def solution(list):
-    '''
-    Enter your code here
-    '''
+    seen = set()
     unique = []
     for x in list:
-        if x not in unique:
+        if x not in seen:
+            seen.add(x)
             unique.append(x)
-    return (unique)
\ No newline at end of file
+
+    print unique
+    return (unique)
+
+solution([1,2,3,1,2,3,4,4,6,2,7,8])
diff --git a/build.pyc b/build.pyc
new file mode 100644
index 0000000..4884357
Binary files /dev/null and b/build.pyc differ
diff --git a/tests/__init__.pyc b/tests/__init__.pyc
new file mode 100644
index 0000000..fe8cf59
Binary files /dev/null and b/tests/__init__.pyc differ
diff --git a/tests/test_solution.pyc b/tests/test_solution.pyc
new file mode 100644
index 0000000..d116599
Binary files /dev/null and b/tests/test_solution.pyc differ