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31 17 31 18 31 19 31 20 31 21 31 22 31 23 31 24 31 25 31 26 31 27 31 28 31 29 31 30 31 31 31 32 31 33 31 34 31 35 31 36 31 37 31 38 31 39 31 40 31 41 31 42 31 43 31 44 31 45 31 46 31 47 1918 1917 1916 1915 1914 1913 1912 1911 1910 1909 1908 1907 1906 1905 1904 1903

= Free Coordinate    = Occupied(Single Region)     = Occupied (Var Region)     = Center of the grid