diff --git a/u3/flatten_array.py b/u3/flatten_array.py
new file mode 100644
index 0000000..d40ade1
--- /dev/null
+++ b/u3/flatten_array.py
@@ -0,0 +1,9 @@
+def flatten(iterable):
+    result = []
+    for x in iterable:
+        if not isinstance(x, list):
+            if x != None:
+                result.append(x)
+        else:
+            result.extend(flatten(x))
+    return result
\ No newline at end of file