numbers = [ 2 , 3 , 6 , 10 , 15 , 19 , 23 , 28 , 30 ], countries = [ Australia , Canada , Denmark , Egypt , France , Germany ], cities = [ Amsterdam , Berlin , Cardiff , Copenhagen , Paris ], memory = [ Bit , Byte , Kilobyte , Megabyte , Petabyte , Zettabyte ]

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