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15 87 15 88 15 89 15 90 15 91 15 92 15 93 15 94 15 95 15 96 15 97 1974 1973 1972 1971 1970 1969 1968 1967 1966 1965

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