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87 4 87 5 87 6 87 7 87 8 87 9 88 0 88 1 88 2 88 3 88 4 1958 1957 1956 1955 1954 1953 1952 1951 1950 1949

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