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23 2 23 3 23 4 23 5 23 6 23 7 23 8 23 9 24 0 24 1 24 2 24 3 24 4 24 5 24 6 24 7 24 8 24 9 25 0 25 1 25 2 25 3 25 4 1973 1972 1971 1970 1969 1968 1967 1966 1965 1964 1963 1962 1961 1960 1959 1958 1957 1956 1955 1954 1953 1952

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