+------------+
| Left |
+------------+
|
|
v
+------------+
| Lefty, too |
+------------+
|
|
v
+------------+
| Right |
+------------+
+------------+
| Left |
+------------+
|
|
v
+------------+
| Lefty, too |
+------------+
|
|
v
+------------+
| Right |
+------------+