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15 28 15 29 15 30 15 31 15 32 15 33 15 34 15 35 15 36 15 37 15 38 1975 1974 1973 1972 1971 1970 1969 1968 1967 1966

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