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87 9 88 0 88 1 88 2 88 3 88 4 88 5 88 6 88 7 88 8 88 9 1969 1968 1967 1966 1965 1964 1963 1962 1961 1960

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