D S - d r a i n
..............................................................................................................................................................................................................
..............................................................................................................................................................................................................
..............................................................................................................................................................................................................
..............................................................................................................................................................................................................
..............................................................................................................................................................................................................
..............................................................................................................................................................................................................
..............................................................................................................................................................................................................
..............................................................................................................................................................................................................
..............................................................................................................................................................................................................
..............................................................................................................................................................................................................
..............................................................................................................................................................................................................
..............................................................................................................................................................................................................
..............................................................................................................................................................................................................
..............................................................................................................................................................................................................
..............................................................................................................................................................................................................
..............................................................................................................................................................................................................
..............................................................................................................................................................................................................
..............................................................................................................................................................................................................
..............................................................................................................................................................................................................
..............................................................................................................................................................................................................
..............................................................................................................................................................................................................
..............................................................................................................................................................................................................
..............................................................................................................................................................................................................
..............................................................................................................................................................................................................
..............................................................................................................................................................................................................
..............................................................................................................................................................................................................
..............................................................................................................................................................................................................
..............................................................................................................................................................................................................
..............................................................................................................................................................................................................
..............................................................................................................................................................................................................
12