+----------------+           +-------------------+
|      +------+  |           |     +------+      |
|  *-->|  T1  |  |     |     | *-->|  T1  |--------+   |
|      +------+  |     |     |     +------+      | |   |
|================|---->|     |===================| +-->|
|      +------+  |     |     |     +------+      | |   |
|  *-->|  T2  |  |     |     | *-->|  T2  |--------+   |
|      +------+  |           |     +------+      |
+----------------+           +-------------------+
