s_2013 (968B)
1 2 3 4 5 6 7 8 9 10 11 12 _ 13 ________|_ 14 _______ _ ___ ------------- 15 / \______\ / \ | | | 16 |\ / + \ |-O-| | | | 17 | | || \ | \_/___|_________|__| 18 | | + + +\ | :/----I----- 19 __\|_|_|_|__\|________________________________________/_____===____