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13 51 13 52 13 53 13 54 13 55 13 56 13 57 13 58 13 59 13 60 13 61 13 62 13 63 13 64 13 65 13 66 1988 1987 1986 1985 1984 1983 1982 1981 1980 1979 1978 1977 1976 1975 1974

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