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87 3 87 4 87 5 87 6 87 7 87 8 87 9 88 0 88 1 88 2 88 3 1976 1975 1974 1973 1972 1971 1970 1969 1968 1967

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