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13 63 13 64 13 65 13 66 13 67 13 68 13 69 13 70 13 71 13 72 13 73 1975 1974 1973 1972 1971 1970 1969 1968 1967 1966

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