────┐       ┌──┐    ┌────┐      ┌──┐              ┌────┐      ┌ ⋅ ⋅ ⋅
    │       │  │    │    │      │  │              │    │      │
    └───────┘  └────┘    └──────┘  └──────────────┘    └──────┘

 40 |  70   |20| 40 | 40 |  60  |20|     140      | 40 |  60  | ⋅ ⋅ ⋅
