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23 4 23 5 23 6 23 7 23 8 23 9 24 0 24 1 24 2 24 3 24 4 1975 1974 1973 1972 1971 1970 1969 1968 1967 1966

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