┌──┬────┐                                
                                  ┌───┘··│····│                                
                                  │····0·│0··0└──┐                             
                            ┌─┬───┤····0····0····│                             
                            │·+···π^│·│·┌───··0··│                             
                            ├─┤···│^│·│·│···┌─┐·┌┘                             
                            │·+···π^│·│···│0│·│·│                         &nb