┌──┬────┐                                
                                  ┌───┘··│···@│                                
                                  │·····0│···0└──┐                             
                            ┌─┬───┤··············│                             
                            │·+·o·π·│·│0┌───···0·│                             
                            ├─┤···│·│·│·│···┌─┐·┌┘                             
                            │·+···π^│·│···│0│·│·│                              
                            ├─┤···│^│·│·│··0··│·│                              
                            │·+···π^│·│·└──·0·0·│                              
                            ├─┴──+┤^│·│····0··0·└┐                             
                            │··